diff --git a/NEWS b/NEWS
index 06f328dd..6b104c30 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,22 @@
+Version 2.7.5 - August 31, 2012
+
+- Adjust opencl intensity when adjusting thread count to prevent it getting
+pegged at a value below the minimum threads possible.
+- miner.h max_hashes -> int64_t
+- Keep the local block number in the blocks structs stored and sort them by
+number to guarantee we delete the oldest when ageing the block struct entries.
+- Use correct sdk version detection for SDK 2.7
+- Revert "Pick worksize 256 with Cypress if none is specified."
+- Test for lagging once more in queue_request to enable work to leak to backup
+pools.
+- There is no need to try to switch pools in select_pool since the current pool
+is actually not affected by the choice of pool to get work from.
+- Only clear the pool lagging flag if we're staging work faster than we're using
+it.
+- needed flag is currently always false in queue_request. Remove it for now.
+- thr is always NULL going into queue_request now.
+
+
 Version 2.7.4 - August 23, 2012
 
 - Perform select_pool even when not lagging to allow it to switch back if needed
diff --git a/cgminer.c b/cgminer.c
index f677a60b..c9114b28 100644
--- a/cgminer.c
+++ b/cgminer.c
@@ -218,6 +218,7 @@ struct timeval block_timeval;
 struct block {
 	char hash[37];
 	UT_hash_handle hh;
+	int block_no;
 };
 
 static struct block *blocks = NULL;
@@ -2811,6 +2812,11 @@ static inline bool from_existing_block(struct work *work)
 	return ret;
 }
 
+static int block_sort(struct block *blocka, struct block *blockb)
+{
+	return blocka->block_no - blockb->block_no;
+}
+
 static void test_work_current(struct work *work)
 {
 	char *hexstr;
@@ -2828,29 +2834,31 @@ static void test_work_current(struct work *work)
 	 * new block and set the current block details to this one */
 	if (!block_exists(hexstr)) {
 		struct block *s = calloc(sizeof(struct block), 1);
+		int deleted_block = 0;
 
 		if (unlikely(!s))
 			quit (1, "test_work_current OOM");
 		strcpy(s->hash, hexstr);
+		s->block_no = new_blocks++;
 		wr_lock(&blk_lock);
-		/* Only keep the last 6 blocks in memory since work from blocks
-		 * before this is virtually impossible and we want to prevent
-		 * memory usage from continually rising */
-		if (HASH_COUNT(blocks) > 5) {
-			struct block *blocka, *blockb;
-			int count = 0;
-
-			HASH_ITER(hh, blocks, blocka, blockb) {
-				if (count++ < 6)
-					continue;
-				HASH_DEL(blocks, blocka);
-				free(blocka);
-			}
+		/* Only keep the last hour's worth of blocks in memory since
+		 * work from blocks before this is virtually impossible and we
+		 * want to prevent memory usage from continually rising */
+		if (HASH_COUNT(blocks) > 6) {
+			struct block *oldblock;
+
+			HASH_SORT(blocks, block_sort);
+			oldblock = blocks;
+			deleted_block = oldblock->block_no;
+			HASH_DEL(blocks, oldblock);
+			free(oldblock);
 		}
 		HASH_ADD_STR(blocks, hash, s);
 		wr_unlock(&blk_lock);
+		if (deleted_block)
+			applog(LOG_DEBUG, "Deleted block %d from database", deleted_block);
 		set_curblock(hexstr, work->data);
-		if (unlikely(++new_blocks == 1))
+		if (unlikely(new_blocks == 1))
 			goto out_free;
 
 		work_block++;
diff --git a/configure.ac b/configure.ac
index 4197da9c..68ea6ca7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 ##--##--##--##--##--##--##--##--##--##--##--##--##--##--##--##--##
 m4_define([v_maj], [2])
 m4_define([v_min], [7])
-m4_define([v_mic], [4])
+m4_define([v_mic], [5])
 ##--##--##--##--##--##--##--##--##--##--##--##--##--##--##--##--##
 m4_define([v_ver], [v_maj.v_min.v_mic])
 m4_define([lt_rev], m4_eval(v_maj + v_min))
diff --git a/driver-opencl.c b/driver-opencl.c
index 6883ada3..ded20c31 100644
--- a/driver-opencl.c
+++ b/driver-opencl.c
@@ -1106,20 +1106,23 @@ static cl_int queue_scrypt_kernel(_clState *clState, dev_blk_ctx *blk, __maybe_u
 }
 #endif
 
-static void set_threads_hashes(unsigned int vectors, unsigned int *threads,
-			       int64_t *hashes, size_t *globalThreads,
-			       unsigned int minthreads, int intensity)
+static void set_threads_hashes(unsigned int vectors,int64_t *hashes, size_t *globalThreads,
+			       unsigned int minthreads, __maybe_unused int *intensity)
 {
-	if (opt_scrypt) {
-		if (intensity < 0)
-			intensity = 0;
-		*threads = 1 << intensity;
-	} else
-		*threads = 1 << (15 + intensity);
-	if (*threads < minthreads)
-		*threads = minthreads;
-	*globalThreads = *threads;
-	*hashes = *threads * vectors;
+	unsigned int threads = 0;
+
+	while (threads < minthreads) {
+		threads = 1 << ((opt_scrypt ? 0 : 15) + *intensity);
+		if (threads < minthreads) {
+			if (likely(*intensity < MAX_INTENSITY))
+				(*intensity)++;
+			else
+				threads = minthreads;
+		}
+	}
+
+	*globalThreads = threads;
+	*hashes = threads * vectors;
 }
 #endif /* HAVE_OPENCL */
 
@@ -1499,15 +1502,13 @@ static int64_t opencl_scanhash(struct thr_info *thr, struct work *work,
 	cl_int status;
 	size_t globalThreads[1];
 	size_t localThreads[1] = { clState->wsize };
-	unsigned int threads;
 	int64_t hashes;
 
 	/* This finish flushes the readbuffer set with CL_FALSE later */
 	if (!gpu->dynamic)
 		clFinish(clState->commandQueue);
 
-	set_threads_hashes(clState->vwidth, &threads, &hashes, globalThreads,
-			   localThreads[0], gpu->intensity);
+	set_threads_hashes(clState->vwidth, &hashes, globalThreads, localThreads[0], &gpu->intensity);
 	if (hashes > gpu->max_hashes)
 		gpu->max_hashes = hashes;
 
diff --git a/miner.h b/miner.h
index 13f4960c..a234ecd3 100644
--- a/miner.h
+++ b/miner.h
@@ -352,7 +352,7 @@ struct cgpu_info {
 	int threads;
 	struct thr_info **thr;
 
-	unsigned int max_hashes;
+	int64_t max_hashes;
 
 	const char *kname;
 #ifdef HAVE_OPENCL
diff --git a/ocl.c b/ocl.c
index fe457822..450a2d61 100644
--- a/ocl.c
+++ b/ocl.c
@@ -393,7 +393,7 @@ _clState *initCl(unsigned int gpu, char *name, size_t nameSize)
 			 strstr(vbuff, "831.4") ||
 			 strstr(vbuff, "898.1") ||  // 12.2 driver SDK 
 			 strstr(vbuff, "923.1") ||  // 12.4
-			 strstr(vbuff, "938.1"))) { // SDK 2.7
+			 strstr(vbuff, "938.2"))) { // SDK 2.7
 				applog(LOG_INFO, "Selecting diablo kernel");
 				clState->chosen_kernel = KL_DIABLO;
 		/* Detect all 7970s, older ATI and NVIDIA and use poclbm */
@@ -411,7 +411,7 @@ _clState *initCl(unsigned int gpu, char *name, size_t nameSize)
 		if (clState->chosen_kernel == KL_PHATK &&
 		    (strstr(vbuff, "844.4") || strstr(vbuff, "851.4") ||
 		     strstr(vbuff, "831.4") || strstr(vbuff, "898.1") ||
-		     strstr(vbuff, "923.1") || strstr(vbuff, "938.1"))) {
+		     strstr(vbuff, "923.1") || strstr(vbuff, "938.2"))) {
 			applog(LOG_WARNING, "WARNING: You have selected the phatk kernel.");
 			applog(LOG_WARNING, "You are running SDK 2.6+ which performs poorly with this kernel.");
 			applog(LOG_WARNING, "Downgrade your SDK and delete any .bin files before starting again.");
@@ -468,12 +468,8 @@ _clState *initCl(unsigned int gpu, char *name, size_t nameSize)
 		clState->wsize = cgpu->work_size;
 	else if (strstr(name, "Tahiti"))
 		clState->wsize = 64;
-	else {
-		if (strstr(name, "Cypress"))
-			clState->wsize = 256;
-		else
-			clState->wsize = (clState->max_work_size <= 256 ? clState->max_work_size : 256) / clState->vwidth;
-	}
+	else
+		clState->wsize = (clState->max_work_size <= 256 ? clState->max_work_size : 256) / clState->vwidth;
 	cgpu->work_size = clState->wsize;
 
 #ifdef USE_SCRYPT