https://community.intel.com/t5/Graphics/Max-IOH-speed-max-GPUs-speed/m-p/210487#M1710 <P>There are two questions really.</P><P></P><P>The first is: what is the 5520 chipset to processor real max. speed?</P><P>Is it limited by the QPI single-link or both links may work together? (in other words, is it limited to raw 12.8GB/s or may support all four PCIe links at a time?</P><P></P><P>The second is: have Intel mesured real bandwidth used by most modern AMD/NVIDIA GPU/GPGPUs?</P><P>It's clear by their internal architecture that their theoretical max throughput may not exeed 1.25GB/s (so up to 6 GPUs may nicely share one x16 link (providing them all by switched x16 links). But is it possible to share the link between, say 8 (or even more) GPUs?</P><P></P><P>The number of PCIe lines is limited, but a fart workstation needs not only ultra-fast graphics, but ultra-fast storage too.</P> Sat, 04 Sep 2010 13:35:33 GMT idata 2010-09-04T13:35:33Z https://community.intel.com/t5/Graphics/Max-IOH-speed-max-GPUs-speed/m-p/210487#M1710 <P>There are two questions really.</P><P></P><P>The first is: what is the 5520 chipset to processor real max. speed?</P><P>Is it limited by the QPI single-link or both links may work together? (in other words, is it limited to raw 12.8GB/s or may support all four PCIe links at a time?</P><P></P><P>The second is: have Intel mesured real bandwidth used by most modern AMD/NVIDIA GPU/GPGPUs?</P><P>It's clear by their internal architecture that their theoretical max throughput may not exeed 1.25GB/s (so up to 6 GPUs may nicely share one x16 link (providing them all by switched x16 links). But is it possible to share the link between, say 8 (or even more) GPUs?</P><P></P><P>The number of PCIe lines is limited, but a fart workstation needs not only ultra-fast graphics, but ultra-fast storage too.</P> Sat, 04 Sep 2010 13:35:33 GMT https://community.intel.com/t5/Graphics/Max-IOH-speed-max-GPUs-speed/m-p/210487#M1710 idata 2010-09-04T13:35:33Z