I am currently running an algorithm using avx on an i5-2500kand aH61 motherboard with DDR3-1033 memory. I get an 8% speedup over the equivalent algorithm using SSE.
It seems that the data flow to the i5 when using AVX is bottlenecked by either the cloggged memory channel or because the memory chip can not supply data fasteror both. I am going to get a DDR3-2133 memory set to speed up the supply of data to the chip to determine whether Ican get more than the 8% speedup out of the AVX.
Would someone who has tried this effect of quicker memory on the AVX performance be kind enough to share their results.
From what I have read I may also use the P67 motherboard instead of the H61 as some have indicated a better memory performance with the use of the P67 alone(i.e. no upgrade in memory frequency). Comments anyone ?