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I5 2500 is rendering faster than 2600k OC'd

post #1 of 17
Thread Starter 
Hey guys,
Did a search and didn't see anything similar to my issue popping up. I recently built 2 PC's, one a core i5 2500 using a base gigabyte z68 mobo with 8 GB ddr 1333 and running a 6770 and the second one using a core i7 2600k (OC'd to 4500 via Multi) , z68 biostar mobo with 16gb DDR 1600 with a 6950.

I've been doing some video editing and processing it using Virtualdub. On the i5, I'm getting rendering rates ~ 50 FPS and with the I7 I'm getting rendering rates ~40 FPS. Can you think of any reason the 2600k would underperform? I checked temps (Max 65 under load) and CPUID is showing the processor running @ ~4.5 ghz. Any ideas? I'm pulling my hair out over here. (to add insult to injury, I have stock cooler on my i5 2500 (not 2500k, btw) and a Hyper n520 on the i7 with arctic silver)

I did run passmark btw, and I'm in the 'normal' range of other i7's OC'd to 4.5.
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post #2 of 17
DO you have ht enabled? I would check and see if it is even getting to 100% cpu usage.
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I7 2600k @ 4.5 ghz 1.4v GIGABYTE GA-Z68XP-UD3P MSI 970 GTX 4G (2x4gb) Corsair XMS3 @ 1866mhz 9-10-9-27 
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Samsung 830 64 gb 500 gb 7200 Rpm DVD-RW Nh-d14 /w 6 Noctua p12/14's 
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Windows 7 64 bit 23in LG Ducky OCN w/ mx cherry browns 850 watt corsair tx 
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post #3 of 17
Thread Starter 
HT is enabled, but CPU usage is low (temps while encoding don't exceed 48)
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post #4 of 17
Did you run the exact same vdub encode job when comparing the two systems? Are the disks used by the two systems identical? I/O can be a bottle neck (crap I hate that term) when encoding, and if it's reaching over a network for a file encoding performance will get hammered.
post #5 of 17
Is your 2600K OC stable?
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post #6 of 17
I don't think its the cpu, i think its the program itself.
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post #7 of 17
Thread Starter 
I think I'm stable, I haven't had time to run a serious test yet. But after running torture test for 2 hours, no issues and temps never increased beyond 65 degrees.

As for the disks, the i7 has a SATA III 1 tb 7200 Seagate system drive and the i5 has a SATA III 1 tb 7200 hitachi drive

I used the same exact file with both, and the file was located locally (I.E. I dragged it on to each desktop prior to encoding)

I'm just so confused. Logic dictates that the I7 would render faster since A) it has a higher clock, B) hyper threading, C) has other faster components.

Both PC's are running a fresh install of home premium with nothing except Roxio, Codecs/Vob sub, Office, and Some Video editing software installed.
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post #8 of 17
If i were you i would run cinebench 11.5 on both and see if the i7 performs better.
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CPUMotherboardGraphicsRAM
I7 2600k @ 4.5 ghz 1.4v GIGABYTE GA-Z68XP-UD3P MSI 970 GTX 4G (2x4gb) Corsair XMS3 @ 1866mhz 9-10-9-27 
Hard DriveHard DriveOptical DriveCooling
Samsung 830 64 gb 500 gb 7200 Rpm DVD-RW Nh-d14 /w 6 Noctua p12/14's 
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Windows 7 64 bit 23in LG Ducky OCN w/ mx cherry browns 850 watt corsair tx 
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CPUMotherboardGraphicsRAM
I7 2600k @ 4.5 ghz 1.4v GIGABYTE GA-Z68XP-UD3P MSI 970 GTX 4G (2x4gb) Corsair XMS3 @ 1866mhz 9-10-9-27 
Hard DriveHard DriveOptical DriveCooling
Samsung 830 64 gb 500 gb 7200 Rpm DVD-RW Nh-d14 /w 6 Noctua p12/14's 
OSMonitorKeyboardPower
Windows 7 64 bit 23in LG Ducky OCN w/ mx cherry browns 850 watt corsair tx 
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post #9 of 17
Crud, I now see your dilemma. Another angle is that the encoding algorithm hyperthreads poorly. This can be tested by using the task manager to explicitly set the execution core affinity of vdub. I recommend two tests:
1. Single core on each box; set vdub affinity to cpu 2 on both systems.
2. Quad core, no HT on each box; on the i7 set affinity to cpus 0,2,4,8 and leave the i5 at default (all cpus).
If the I7 still 'fails' both of these, I'd run LinX to get a gflops rating using the above affinity settings to see if you got a hardware issue (possibly IO/ram). Linx is good because it links CPU and RAM performance, i.e. bad RAM latency/throughput will lower scores noticably. BTW, Linx hates HT. SiSandra also has a huge suite of subsystem benchmark tests that may be useful here.

In case you don't know: To set affinity in the task manager, right click the vdub application in the task manager, select 'go to process', then right click the vdub process and select 'set affinity'. The process is allow to run the checked cpus displayed in the affinity window.
Edited by *AcidBath* - 10/21/11 at 2:10pm
post #10 of 17
Thread Starter 
cinebench results:

I5 5.39
I7 (no OC) 8
I7 (Oc'd to 4.4) 7.94

During the OC test, CPUID reported throttling down to 4100, but that should still increase performance over 3.8

Trying Acidbath's rec's now.
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