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| Unofficial VirtualDub Support Forums > General Discussion > I5 2500 Running Faster Than I7 2600k |
| Posted by: dandlewood Oct 21 2011, 08:26 PM |
| Didn't see anything posted about this. I'm running two setups, with the i7 2600k superior in every way. When rendering a 1.3GB HD video file using xvid compression, I'm getting ~50 FPS rendered on my I5 and about ~40 on my i7. Any thoughts on why this is happening? (my i7 is overclocked, but I went back to regular settings and it didn't change anything) Systems: i7 2600k OC 4500 (max temp 65), 1600 DDR3 Corsair Ram, SATA III 7200 hd, 6950 video card I5 2500 (mild Turbo OT), 1333 RAM, SATA III 7200 HD, 6770 video card |
| Posted by: phaeron Oct 23 2011, 06:38 PM |
| Check your threading settings on the XviD codec and try lowering the thread count if there is a setting for it. The i7 has hyperthreading while the i5 doesn't, so it's possible that XviD is trying to use more threads than is beneficial. The extra four hardware threads on the i7 compete for CPU resources and so they're not a guaranteed gain like the first four threads. |
| Posted by: evropej Oct 23 2011, 11:48 PM |
| I have a 950 and I can tell you that my testing showed hyperthreading to waste cpu time. Turn that off! Make sure you are using the same HD as well because this is a huge bottleneck. My SSD sucks when it comes to rendering or capturing, use a 7200 HD instead. |
| Posted by: dandlewood Oct 24 2011, 01:54 PM |
| using a 7200 HD for both. went down to 4 threads and performance increased slightly, but the i5 is still consistently faster. |
| Posted by: evropej Oct 24 2011, 02:10 PM |
| The mobo can be an issue as well, since some run better then others. Is windows configured the same in both machines? The HDD's have same amount of cache? Next processor I purchase will not have HT. I could of saved tons buying the core i5 version. I caught in the marketing but now I learned my lesson. |
| Posted by: dandlewood Oct 24 2011, 07:25 PM |
| yeah, it's a clean install of windows 7 home premium on both. I hear ya, I feel a bit cheated. it's one thing to run some programs better and some the same, but I'd never think the 2600k would run some programs worse than the 2500. if I knew, I would have bought an i5 with water cooling and just O'C'd it to 5ghz and been completely happy. |
| Posted by: phaeron Nov 1 2011, 06:02 AM |
| Another thing you can try is forcing Windows to use only one thread per core, effectively avoiding HT. You can do this by right-clicking on the program in Task Manager, selecting Set Affinity, and only enabling even or odd threads exclusively. |
| Posted by: -vdub- Jul 23 2012, 07:59 PM |
| Interesting I was wondering about this since have seen many tests and other test the I7 2600 (and unlocked K) score far above the I5 2500. Though those scores are tempting for others to buy 26600 (k). I agree atm with some test I have done cpu and graphics draw render that there is no difference with HT active to de-active. This is with a few HT cpu I have tested on various motherboards. I am thinking of upgrading but won't be buying HT it's not worth it for the little gain they have. Maybe HT is geared more towards games since that is only thing I have not tested, that with video compression. |