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i5 2500k bottlenecking 6870s?

post #1 of 30
Thread Starter 
Hey,
I recently finished a build with an i5 2500k and 2 hd6870s. The full specs are below. When in games such as Crysis, I get approximately 60-70fps, but sometimes the fps drops down to 30-25. You would expect the fps drop to be because of increased gpu demand, but it appears that when the drop occurs the gpus are running at 50-70% instead of 90%+ I lowered the cpu multiplier from 42 (4.2ghz) to 34 (3.4ghz) just to see what would happen, and what do you know, the fps dips even lower and I see lower average fps. I thought the 2500k was supposed to be able to handle these cards at stock? What's up?

i5 2500k @ 4.2ghz
Sabertooth P67 REV3
2 XFX reference 6870s stock
750w kingwin lazer
8gb ddr3 1600mhz corsair vengeance
1tb hdd
All temps (except gpu) less than 55c
Gpu temps ~75 full load
Edited by Martin 71 - 7/28/11 at 6:33am
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post #2 of 30
I am quite sure your CPU would not bottleneck those cards. You might have a problem with your drivers
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post #3 of 30
There's not much that would handle them any better so if you're bottlenecked, OC higher until you can't anymore.
Short of upgrading such a new chip there isn't much else you can do.

Edit: Also, crossfire isn't perfect so it might just be CF not scaling 100% all of the time. Not surprising really.
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post #4 of 30
Quote:
Originally Posted by Mike-IRL View Post
There's not much that would handle them any better so if you're bottlenecked, OC higher until you can't anymore.
Short of upgrading such a new chip there isn't much else you can do.

Edit: Also, crossfire isn't perfect so it might just be CF not scaling 100% all of the time. Not surprising really.
Running antivirus software?
you have the best gaming cpu that exists so...
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post #5 of 30
I am not 100% sure if this will work, but I recommend this: once you get into your saved game (that is, once you are finally in the game), switch to Windowed Mode and then switch back. That is, disable Full Screen mode and then enable it. After that, play for a while and see if things are any different or better.

A quicker way to do this is with Alt+Enter. Press Alt+Enter once or twice (or three times) until it's clear that you are in Windowed Mode. I mean, the goal is to be able to see a window Title Bar at the top and everything. Once you see that, press Alt+Enter again to get back to Full Screen mode and then play for a while to see if there's any difference or improvement.

For me, this makes Crysis 1 play liquid smooth at all times (with Vertical Sync enabled too).
Edited by TwoCables - 7/28/11 at 6:42am
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post #6 of 30
Thread Starter 
Hey, everybody, I did try the alt-enter trick and still no luck. I'm starting to think it's a driver bug since it didn't occur with older drivers. I tried wiping and reverting back to 11.6 but I guess maybe driver sweeper didn't get everything. It's still happeing... Not entirely sure why. I've done everything I can short of formatting and re-installing windows. I suppose I'll just wait it out until the next update. Is it possible that these newer drivers are more cpu dependent?
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post #7 of 30
I have 3 480's overclocked to 875/2000 1.175v and the 2500k handles it just fine. Your 2 6870's and not being bottleneck by your chip. I play Crysis 2 all the time and have no problems and I play maxed settings with 5760x1080 res.
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post #8 of 30
Thread Starter 
Okay, this is all pretty good news for me then. I suppose I'll just blame bad drivers and wait it out... Next time, I'm buying nVidia.
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post #9 of 30
Quote:
Originally Posted by Martin 71 View Post
Okay, this is all pretty good news for me then. I suppose I'll just blame bad drivers and wait it out... Next time, I'm buying nVidia.
If it didn't do it before, it does now, and rolling back your drivers didn't work then it's more likely that you've got some other software problem and it isn't drivers.
Do you have any programs running that might be stealing CPU time away from the game?
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Ex-Kentsfield rig
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Q6600 RIG :D
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CPUMotherboardGraphicsRAM
4790k MSI Z97M Gaming 780 Ti SLi Corsair Vengeance pro 2x8GB 
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Seagate NAS 240GB m500s RAID 0 MCP 350 w/ res top >> MCP655 >> Heatkiller full... Windows 8.1 
MonitorKeyboardPowerCase
3X QNIX 2560x1440 @ 110Hz G910 EVGA Supernova 1000 G2 Stacker 830 
MouseMouse PadAudioAudio
G402 / Deathadder 2K13 League of legends one, cloth ODAC >> O2 >> HD800 / K702s Samson mediaone 5as 
AudioOtherOtherOther
Samson GoMic Asus wireless AC Logitech G27 Logitech C920 Webcam 
CPUMotherboardGraphicsRAM
Q6600 Asus P5Q-E 8800GTX Crucial Ballistix Tracers 
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post #10 of 30
Thread Starter 
On startup I have Msi Afterburner, CCC, Steam, Fraps, and Logitech Setpoint. I tried to minimize everything that starts with my system. Afterburner is what I use to monitor gpu usage.
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Hard DriveOptical DriveOSMonitor
1TB Seagate 7200 RPM Something from eBay Windows 7 Ultimate x64 Hanns-G HZ201 1600x900 
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