- not much

ethminer/MinerAux.h

@@ -614,7 +614,10 @@ private:
 		else if (_m == MinerType::CUDA)
 			f.start("cuda");
 
-		EthashAux::FullType dag;
+		// h256 seedHash = h256("0x6d29f6dd1270e49744bd5377ec86395b2de2abbe54bae16281b8e39b35538dcd");
+		h256 seedHash = h256("0x0000000000000000000000000000000000000000000000000000000000000000");
+
+		EthashAux::FullType dag = EthashAux::full(seedHash, false, nullptr);
 
 		int time = 0;
 
@@ -662,10 +665,9 @@ private:
 			h256 hh;
 			std::random_device engine;
 			hh.randomize(engine);
-			h256 newSeedHash = h256();
 			
 			current.headerHash = hh;
-			current.seedHash = newSeedHash;
+			current.seedHash = seedHash;
 			current.boundary = genesis.boundary();
 			minelog << "Generated random work package:";
 			minelog << "  Header-hash:" << current.headerHash.hex();

libethash-cuda/keccak.cuh

@@ -56,7 +56,7 @@ __device__ __forceinline__ void keccak_f1600_block(uint2* s, uint32_t out_size)
 {
 	uint2 t[5], u, v;
 
-#pragma unroll 3
+
 	for (int i = 0; i < 24; i++)
 	{
 		/* theta: c = a[0,i] ^ a[1,i] ^ .. a[4,i] */