Quote Originally Posted by informal View Post
Well now we have 2 of them:
Details for Device 2x AMD Opteron 6220
2x AMD Opteron 6282 SE

To save you the boring math and long story,the results kinda match with only one thing standing out. Multi-Media Benchmark performance of the 6220 (per core!) is kinda low compared to 6282 (per core). Now I'm pretty sure I know at what clock the 6282 runs. It's either 2.5Ghz base or 2.6Ghz base. I assume it's 2.5Ghz. So the Multi-Media Benchmark for 1P 6282SE would roughly be around : 585/1.95=300 mpix/s which is only 5% lower than what supposedly 2P 3Ghz Valencia gets . If we take that 2.5Ghz 1P 6282SE scores 300 then 3Ghz 1P 6282SE would get ~360 and then this would imply 8C performance at 3Ghz is around 180Mpix/s . Compare to Zambezi's(8C 3Ghz) 157Mpix/s and 6220's (1P 8C 3Ghz) 161Mpix/s and you see the difference : it's better by 15%/12% roughly.

So to conclude : Zambezi's result deviate from Opterons ,per core and per clock,by: 15-18% in integer benchmark and 3-15% in Multimedia(AVX) benchmark (depending on the opterons used for comparison). Once small caveat though : I have noticed that Lisbon platform scores around 30% better at the same clock versus Thuban ! I think this may be due to NUMA (2P Lisbons). So if this is translated to Interlagos too,then none of the above is relevant and Zambezi's original (bad) Sisoft results may even be genuine...

edit: oh and one more thing I forgot to mention. Interlagos at the same core count and roughly same clock is noticeably slower in integer benchmark than Lisbon/MC (generation). Interlagos can clock higher though but IPC difference is very high (think more than 15%). and yes it is noticeably faster in Multimedia one but integer represents a big chunk of both server and desktop workloads,so it is kind of a letdown IMO. All that talk about integer cores being faster etc. and then we get this... I guess it still may not be final platform/BIOS but it doesn't look promising in integer workloads.
well, one integer thread in bulldozer is not as strong as one integer thread in thuban, but tuban has six and bulldozer 8. so if single-thread integer performance is kinda low on bd, it doesnt surprise me... bd needs turbo to solve that.