diff --git a/go/store/nbs/aws_table_persister.go b/go/store/nbs/aws_table_persister.go
index 920a04d8ff2..400cb3fdf97 100644
--- a/go/store/nbs/aws_table_persister.go
+++ b/go/store/nbs/aws_table_persister.go
@@ -34,6 +34,8 @@ import (
 
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/aws/aws-sdk-go/service/s3/s3iface"
+	"github.com/aws/aws-sdk-go/service/s3/s3manager"
 
 	"github.com/dolthub/dolt/go/store/atomicerr"
 	"github.com/dolthub/dolt/go/store/chunks"
@@ -55,7 +57,7 @@ const (
 )
 
 type awsTablePersister struct {
-	s3     s3svc
+	s3     s3iface.S3API
 	bucket string
 	rl     chan struct{}
 	ddb    *ddbTableStore
@@ -120,21 +122,20 @@ func (s3p awsTablePersister) CopyTableFile(ctx context.Context, r io.ReadCloser,
 		}
 	}()
 
-	data, err := io.ReadAll(r)
-	if err != nil {
-		return err
-	}
-
 	name, err := parseAddr(fileId)
 	if err != nil {
 		return err
 	}
 
-	if s3p.limits.tableFitsInDynamo(name, len(data), chunkCount) {
+	if s3p.limits.tableFitsInDynamo(name, int(fileSz), chunkCount) {
+		data, err := io.ReadAll(r)
+		if err != nil {
+			return err
+		}
 		return s3p.ddb.Write(ctx, name, data)
 	}
 
-	return s3p.multipartUpload(ctx, data, fileId)
+	return s3p.multipartUpload(ctx, r, fileSz, fileId)
 }
 
 func (s3p awsTablePersister) Path() string {
@@ -174,7 +175,7 @@ func (s3p awsTablePersister) Persist(ctx context.Context, mt *memTable, haver ch
 		return newReaderFromIndexData(ctx, s3p.q, data, name, &dynamoTableReaderAt{ddb: s3p.ddb, h: name}, s3BlockSize)
 	}
 
-	err = s3p.multipartUpload(ctx, data, name.String())
+	err = s3p.multipartUpload(ctx, bytes.NewReader(data), uint64(len(data)), name.String())
 
 	if err != nil {
 		return emptyChunkSource{}, err
@@ -184,20 +185,16 @@ func (s3p awsTablePersister) Persist(ctx context.Context, mt *memTable, haver ch
 	return newReaderFromIndexData(ctx, s3p.q, data, name, tra, s3BlockSize)
 }
 
-func (s3p awsTablePersister) multipartUpload(ctx context.Context, data []byte, key string) error {
-	uploadID, err := s3p.startMultipartUpload(ctx, key)
-
-	if err != nil {
-		return err
-	}
-
-	multipartUpload, err := s3p.uploadParts(ctx, data, key, uploadID)
-	if err != nil {
-		_ = s3p.abortMultipartUpload(ctx, key, uploadID)
-		return err
-	}
-
-	return s3p.completeMultipartUpload(ctx, key, uploadID, multipartUpload)
+func (s3p awsTablePersister) multipartUpload(ctx context.Context, r io.Reader, sz uint64, key string) error {
+	uploader := s3manager.NewUploaderWithClient(s3p.s3, func(u *s3manager.Uploader) {
+		u.PartSize = int64(s3p.limits.partTarget)
+	})
+	_, err := uploader.Upload(&s3manager.UploadInput{
+		Bucket: aws.String(s3p.bucket),
+		Key:    aws.String(s3p.key(key)),
+		Body:   r,
+	})
+	return err
 }
 
 func (s3p awsTablePersister) startMultipartUpload(ctx context.Context, key string) (string, error) {
@@ -234,85 +231,6 @@ func (s3p awsTablePersister) completeMultipartUpload(ctx context.Context, key, u
 	return err
 }
 
-func (s3p awsTablePersister) uploadParts(ctx context.Context, data []byte, key, uploadID string) (*s3.CompletedMultipartUpload, error) {
-	sent, failed, done := make(chan s3UploadedPart), make(chan error), make(chan struct{})
-
-	numParts := getNumParts(uint64(len(data)), s3p.limits.partTarget)
-
-	if numParts > maxS3Parts {
-		return nil, errors.New("exceeded maximum parts")
-	}
-
-	var wg sync.WaitGroup
-	sendPart := func(partNum, start, end uint64) {
-		if s3p.rl != nil {
-			s3p.rl <- struct{}{}
-			defer func() { <-s3p.rl }()
-		}
-		defer wg.Done()
-
-		// Check if upload has been terminated
-		select {
-		case <-done:
-			return
-		default:
-		}
-		// Upload the desired part
-		if partNum == numParts { // If this is the last part, make sure it includes any overflow
-			end = uint64(len(data))
-		}
-		etag, err := s3p.uploadPart(ctx, data[start:end], key, uploadID, int64(partNum))
-		if err != nil {
-			failed <- err
-			return
-		}
-		// Try to send along part info. In the case that the upload was aborted, reading from done allows this worker to exit correctly.
-		select {
-		case sent <- s3UploadedPart{int64(partNum), etag}:
-		case <-done:
-			return
-		}
-	}
-	for i := uint64(0); i < numParts; i++ {
-		wg.Add(1)
-		partNum := i + 1 // Parts are 1-indexed
-		start, end := i*s3p.limits.partTarget, (i+1)*s3p.limits.partTarget
-		go sendPart(partNum, start, end)
-	}
-	go func() {
-		wg.Wait()
-		close(sent)
-		close(failed)
-	}()
-
-	multipartUpload := &s3.CompletedMultipartUpload{}
-	var firstFailure error
-	for cont := true; cont; {
-		select {
-		case sentPart, open := <-sent:
-			if open {
-				multipartUpload.Parts = append(multipartUpload.Parts, &s3.CompletedPart{
-					ETag:       aws.String(sentPart.etag),
-					PartNumber: aws.Int64(sentPart.idx),
-				})
-			}
-			cont = open
-
-		case err := <-failed:
-			if err != nil && firstFailure == nil { // nil err may happen when failed gets closed
-				firstFailure = err
-				close(done)
-			}
-		}
-	}
-
-	if firstFailure == nil {
-		close(done)
-	}
-	sort.Sort(partsByPartNum(multipartUpload.Parts))
-	return multipartUpload, firstFailure
-}
-
 func getNumParts(dataLen, minPartSize uint64) uint64 {
 	numParts := dataLen / minPartSize
 	if numParts == 0 {
diff --git a/go/store/nbs/aws_table_persister_test.go b/go/store/nbs/aws_table_persister_test.go
index e2cdc930f61..f0b8aa2a29b 100644
--- a/go/store/nbs/aws_table_persister_test.go
+++ b/go/store/nbs/aws_table_persister_test.go
@@ -23,6 +23,7 @@ package nbs
 
 import (
 	"context"
+	crand "crypto/rand"
 	"io"
 	"math/rand"
 	"sync"
@@ -31,30 +32,66 @@ import (
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/request"
 	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/aws/aws-sdk-go/service/s3/s3iface"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
 	"github.com/dolthub/dolt/go/store/util/sizecache"
 )
 
+func randomChunks(t *testing.T, r *rand.Rand, sz int) [][]byte {
+	buf := make([]byte, sz)
+	_, err := io.ReadFull(crand.Reader, buf)
+	require.NoError(t, err)
+
+	var ret [][]byte
+	var i int
+	for i < len(buf) {
+		j := int(r.NormFloat64()*1024 + 4096)
+		if i+j >= len(buf) {
+			ret = append(ret, buf[i:])
+		} else {
+			ret = append(ret, buf[i:i+j])
+		}
+		i += j
+	}
+
+	return ret
+}
+
+func TestRandomChunks(t *testing.T) {
+	r := rand.New(rand.NewSource(1024))
+	res := randomChunks(t, r, 10)
+	assert.Len(t, res, 1)
+	res = randomChunks(t, r, 4096+2048)
+	assert.Len(t, res, 2)
+	res = randomChunks(t, r, 4096+4096)
+	assert.Len(t, res, 3)
+}
+
 func TestAWSTablePersisterPersist(t *testing.T) {
 	ctx := context.Background()
 	calcPartSize := func(rdr chunkReader, maxPartNum uint64) uint64 {
 		return maxTableSize(uint64(mustUint32(rdr.count())), mustUint64(rdr.uncompressedLen())) / maxPartNum
 	}
 
-	mt := newMemTable(testMemTableSize)
+	r := rand.New(rand.NewSource(1024))
+	const sz15mb = 1 << 20 * 15
+	mt := newMemTable(sz15mb)
+	testChunks := randomChunks(t, r, 1<<20*12)
 	for _, c := range testChunks {
 		assert.Equal(t, mt.addChunk(computeAddr(c), c), chunkAdded)
 	}
 
+	var limits5mb = awsLimits{partTarget: 1 << 20 * 5}
+	var limits64mb = awsLimits{partTarget: 1 << 20 * 64}
+
 	t.Run("PersistToS3", func(t *testing.T) {
 		testIt := func(t *testing.T, ns string) {
 			t.Run("InMultipleParts", func(t *testing.T) {
 				assert := assert.New(t)
 				s3svc, ddb := makeFakeS3(t), makeFakeDTS(makeFakeDDB(t), nil)
-				limits := awsLimits{partTarget: calcPartSize(mt, 3)}
-				s3p := awsTablePersister{s3: s3svc, bucket: "bucket", ddb: ddb, limits: limits, ns: ns, q: &UnlimitedQuotaProvider{}}
+				s3p := awsTablePersister{s3: s3svc, bucket: "bucket", ddb: ddb, limits: limits5mb, ns: ns, q: &UnlimitedQuotaProvider{}}
 
 				src, err := s3p.Persist(context.Background(), mt, nil, &Stats{})
 				require.NoError(t, err)
@@ -72,8 +109,7 @@ func TestAWSTablePersisterPersist(t *testing.T) {
 				assert := assert.New(t)
 
 				s3svc, ddb := makeFakeS3(t), makeFakeDTS(makeFakeDDB(t), nil)
-				limits := awsLimits{partTarget: calcPartSize(mt, 1)}
-				s3p := awsTablePersister{s3: s3svc, bucket: "bucket", ddb: ddb, limits: limits, ns: ns, q: &UnlimitedQuotaProvider{}}
+				s3p := awsTablePersister{s3: s3svc, bucket: "bucket", ddb: ddb, limits: limits64mb, ns: ns, q: &UnlimitedQuotaProvider{}}
 
 				src, err := s3p.Persist(context.Background(), mt, nil, &Stats{})
 				require.NoError(t, err)
@@ -89,8 +125,8 @@ func TestAWSTablePersisterPersist(t *testing.T) {
 			t.Run("NoNewChunks", func(t *testing.T) {
 				assert := assert.New(t)
 
-				mt := newMemTable(testMemTableSize)
-				existingTable := newMemTable(testMemTableSize)
+				mt := newMemTable(sz15mb)
+				existingTable := newMemTable(sz15mb)
 
 				for _, c := range testChunks {
 					assert.Equal(mt.addChunk(computeAddr(c), c), chunkAdded)
@@ -98,8 +134,7 @@ func TestAWSTablePersisterPersist(t *testing.T) {
 				}
 
 				s3svc, ddb := makeFakeS3(t), makeFakeDTS(makeFakeDDB(t), nil)
-				limits := awsLimits{partTarget: 1 << 10}
-				s3p := awsTablePersister{s3: s3svc, bucket: "bucket", ddb: ddb, limits: limits, ns: ns, q: &UnlimitedQuotaProvider{}}
+				s3p := awsTablePersister{s3: s3svc, bucket: "bucket", ddb: ddb, limits: limits5mb, ns: ns, q: &UnlimitedQuotaProvider{}}
 
 				src, err := s3p.Persist(context.Background(), mt, existingTable, &Stats{})
 				require.NoError(t, err)
@@ -115,8 +150,7 @@ func TestAWSTablePersisterPersist(t *testing.T) {
 
 				s3svc := &failingFakeS3{makeFakeS3(t), sync.Mutex{}, 1}
 				ddb := makeFakeDTS(makeFakeDDB(t), nil)
-				limits := awsLimits{partTarget: calcPartSize(mt, 4)}
-				s3p := awsTablePersister{s3: s3svc, bucket: "bucket", ddb: ddb, limits: limits, ns: ns, q: &UnlimitedQuotaProvider{}}
+				s3p := awsTablePersister{s3: s3svc, bucket: "bucket", ddb: ddb, limits: limits5mb, ns: ns, q: &UnlimitedQuotaProvider{}}
 
 				_, err := s3p.Persist(context.Background(), mt, nil, &Stats{})
 				assert.Error(err)
@@ -330,14 +364,15 @@ func TestAWSTablePersisterCalcPartSizes(t *testing.T) {
 
 func TestAWSTablePersisterConjoinAll(t *testing.T) {
 	ctx := context.Background()
-	targetPartSize := uint64(1024)
+	const sz5mb = 1 << 20 * 5
+	targetPartSize := uint64(sz5mb)
 	minPartSize, maxPartSize := targetPartSize, 5*targetPartSize
 	maxItemSize, maxChunkCount := int(targetPartSize/2), uint32(4)
 
 	rl := make(chan struct{}, 8)
 	defer close(rl)
 
-	newPersister := func(s3svc s3svc, ddb *ddbTableStore) awsTablePersister {
+	newPersister := func(s3svc s3iface.S3API, ddb *ddbTableStore) awsTablePersister {
 		return awsTablePersister{
 			s3svc,
 			"bucket",
diff --git a/go/store/nbs/s3_fake_test.go b/go/store/nbs/s3_fake_test.go
index fe48bcea9cf..d05be408dbb 100644
--- a/go/store/nbs/s3_fake_test.go
+++ b/go/store/nbs/s3_fake_test.go
@@ -33,8 +33,10 @@ import (
 	"time"
 
 	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/client/metadata"
 	"github.com/aws/aws-sdk-go/aws/request"
 	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/aws/aws-sdk-go/service/s3/s3iface"
 	"github.com/stretchr/testify/assert"
 
 	"github.com/dolthub/dolt/go/store/d"
@@ -58,6 +60,8 @@ func makeFakeS3(t *testing.T) *fakeS3 {
 }
 
 type fakeS3 struct {
+	s3iface.S3API
+
 	assert *assert.Assertions
 
 	mu                sync.Mutex
@@ -279,3 +283,37 @@ func (m *fakeS3) PutObjectWithContext(ctx aws.Context, input *s3.PutObjectInput,
 
 	return &s3.PutObjectOutput{}, nil
 }
+
+func (m *fakeS3) GetObjectRequest(input *s3.GetObjectInput) (*request.Request, *s3.GetObjectOutput) {
+	out := &s3.GetObjectOutput{}
+	var handlers request.Handlers
+	handlers.Send.PushBack(func(r *request.Request) {
+		res, err := m.GetObjectWithContext(r.Context(), input)
+		r.Error = err
+		if res != nil {
+			*(r.Data.(*s3.GetObjectOutput)) = *res
+		}
+	})
+	return request.New(aws.Config{}, metadata.ClientInfo{}, handlers, nil, &request.Operation{
+		Name:       "GetObject",
+		HTTPMethod: "GET",
+		HTTPPath:   "/{Bucket}/{Key+}",
+	}, input, out), out
+}
+
+func (m *fakeS3) PutObjectRequest(input *s3.PutObjectInput) (*request.Request, *s3.PutObjectOutput) {
+	out := &s3.PutObjectOutput{}
+	var handlers request.Handlers
+	handlers.Send.PushBack(func(r *request.Request) {
+		res, err := m.PutObjectWithContext(r.Context(), input)
+		r.Error = err
+		if res != nil {
+			*(r.Data.(*s3.PutObjectOutput)) = *res
+		}
+	})
+	return request.New(aws.Config{}, metadata.ClientInfo{}, handlers, nil, &request.Operation{
+		Name:       "PutObject",
+		HTTPMethod: "PUT",
+		HTTPPath:   "/{Bucket}/{Key+}",
+	}, input, out), out
+}
diff --git a/go/store/nbs/s3_table_reader.go b/go/store/nbs/s3_table_reader.go
index 179d5b9a38b..05db80deb0e 100644
--- a/go/store/nbs/s3_table_reader.go
+++ b/go/store/nbs/s3_table_reader.go
@@ -34,8 +34,8 @@ import (
 	"time"
 
 	"github.com/aws/aws-sdk-go/aws"
-	"github.com/aws/aws-sdk-go/aws/request"
 	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/aws/aws-sdk-go/service/s3/s3iface"
 	"github.com/jpillora/backoff"
 	"golang.org/x/sync/errgroup"
 )
@@ -50,16 +50,6 @@ type s3TableReaderAt struct {
 	h  addr
 }
 
-type s3svc interface {
-	AbortMultipartUploadWithContext(ctx aws.Context, input *s3.AbortMultipartUploadInput, opts ...request.Option) (*s3.AbortMultipartUploadOutput, error)
-	CreateMultipartUploadWithContext(ctx aws.Context, input *s3.CreateMultipartUploadInput, opts ...request.Option) (*s3.CreateMultipartUploadOutput, error)
-	UploadPartWithContext(ctx aws.Context, input *s3.UploadPartInput, opts ...request.Option) (*s3.UploadPartOutput, error)
-	UploadPartCopyWithContext(ctx aws.Context, input *s3.UploadPartCopyInput, opts ...request.Option) (*s3.UploadPartCopyOutput, error)
-	CompleteMultipartUploadWithContext(ctx aws.Context, input *s3.CompleteMultipartUploadInput, opts ...request.Option) (*s3.CompleteMultipartUploadOutput, error)
-	GetObjectWithContext(ctx aws.Context, input *s3.GetObjectInput, opts ...request.Option) (*s3.GetObjectOutput, error)
-	PutObjectWithContext(ctx aws.Context, input *s3.PutObjectInput, opts ...request.Option) (*s3.PutObjectOutput, error)
-}
-
 func (s3tra *s3TableReaderAt) Close() error {
 	return nil
 }
@@ -78,7 +68,7 @@ func (s3tra *s3TableReaderAt) ReadAtWithStats(ctx context.Context, p []byte, off
 
 // TODO: Bring all the multipart upload and remote-conjoin stuff over here and make this a better analogue to ddbTableStore
 type s3ObjectReader struct {
-	s3     s3svc
+	s3     s3iface.S3API
 	bucket string
 	readRl chan struct{}
 	ns     string
diff --git a/go/store/nbs/s3_table_reader_test.go b/go/store/nbs/s3_table_reader_test.go
index 264222b16b9..787353df638 100644
--- a/go/store/nbs/s3_table_reader_test.go
+++ b/go/store/nbs/s3_table_reader_test.go
@@ -32,6 +32,7 @@ import (
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/request"
 	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/aws/aws-sdk-go/service/s3/s3iface"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -88,16 +89,16 @@ func TestS3TableReaderAtNamespace(t *testing.T) {
 }
 
 type flakyS3 struct {
-	s3svc
+	s3iface.S3API
 	alreadyFailed map[string]struct{}
 }
 
-func makeFlakyS3(svc s3svc) *flakyS3 {
+func makeFlakyS3(svc s3iface.S3API) *flakyS3 {
 	return &flakyS3{svc, map[string]struct{}{}}
 }
 
 func (fs3 *flakyS3) GetObjectWithContext(ctx aws.Context, input *s3.GetObjectInput, opts ...request.Option) (*s3.GetObjectOutput, error) {
-	output, err := fs3.s3svc.GetObjectWithContext(ctx, input)
+	output, err := fs3.S3API.GetObjectWithContext(ctx, input)
 
 	if err != nil {
 		return nil, err
diff --git a/go/store/nbs/store.go b/go/store/nbs/store.go
index 5f1ee8172f8..a63bc59e776 100644
--- a/go/store/nbs/store.go
+++ b/go/store/nbs/store.go
@@ -33,6 +33,7 @@ import (
 	"time"
 
 	"cloud.google.com/go/storage"
+	"github.com/aws/aws-sdk-go/service/s3/s3iface"
 	"github.com/dustin/go-humanize"
 	lru "github.com/hashicorp/golang-lru/v2"
 	"github.com/pkg/errors"
@@ -483,7 +484,7 @@ func OverwriteStoreManifest(ctx context.Context, store *NomsBlockStore, root has
 	return nil
 }
 
-func NewAWSStoreWithMMapIndex(ctx context.Context, nbfVerStr string, table, ns, bucket string, s3 s3svc, ddb ddbsvc, memTableSize uint64, q MemoryQuotaProvider) (*NomsBlockStore, error) {
+func NewAWSStoreWithMMapIndex(ctx context.Context, nbfVerStr string, table, ns, bucket string, s3 s3iface.S3API, ddb ddbsvc, memTableSize uint64, q MemoryQuotaProvider) (*NomsBlockStore, error) {
 	cacheOnce.Do(makeGlobalCaches)
 	readRateLimiter := make(chan struct{}, 32)
 	p := &awsTablePersister{
@@ -499,7 +500,7 @@ func NewAWSStoreWithMMapIndex(ctx context.Context, nbfVerStr string, table, ns,
 	return newNomsBlockStore(ctx, nbfVerStr, mm, p, q, inlineConjoiner{defaultMaxTables}, memTableSize)
 }
 
-func NewAWSStore(ctx context.Context, nbfVerStr string, table, ns, bucket string, s3 s3svc, ddb ddbsvc, memTableSize uint64, q MemoryQuotaProvider) (*NomsBlockStore, error) {
+func NewAWSStore(ctx context.Context, nbfVerStr string, table, ns, bucket string, s3 s3iface.S3API, ddb ddbsvc, memTableSize uint64, q MemoryQuotaProvider) (*NomsBlockStore, error) {
 	cacheOnce.Do(makeGlobalCaches)
 	readRateLimiter := make(chan struct{}, 32)
 	p := &awsTablePersister{