If you don't need that many cores you can get a X5667. They are the same speed as a X5675 but only have 4 cores instead of 6. The advantage is they cost almost half as much as the X5675. Here is one for $95...
When running Cinebench CPUZ sees the L5640 jumping between 2.26Ghz and 2.39Ghz. It can only reach max turbo speed of 2.79Ghz when only 5 or 4 cores are idle. The X5650 at stock speed would be jumping between 2.66Ghz and 2.79 Ghz. Max turbo speed is 3.06Ghz. That motherboard will not fit your...
2 x L5640 @ 2.27Ghz without hyperthreading
HandBrake 0.9.9.5530 - 64bit Version
OS: Microsoft Windows NT 6.1.7601 Service Pack 1
CPU: Intel(R) Xeon(R) CPU L5640 @ 2.27GHz
Ram: 12278 MB, Screen: 1920x1200
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
x264 [info]...
I estimate if 2 x X5650 is not overclocked it will get about 275 fps. The L5640 is rated as 2.26Ghz and 2.79 Ghz Turbo. I think it is showing a decrease in 2x hyperthreading is because the system can not supply 24 threads with enough data. Even with 12 threads the system can not keep the cores...
I have a Supermicro X8DTi with 2 x L5640s. It can use non ECC DDR3 1333 in 12 slots. Max is 12x4GB for 48GB total. For Reg ECC you can have 12x16GB for 192GB total. I have 6x2GB ECC. I tested Handbrake with 1 x L5640 and I got about 160 fps with hyperthreading. With 2 x L5640 I got about 253 fps...
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