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Crossfire 7770's BF3 FPS drop

post #1 of 19
Thread Starter 
I crossfired a couple of 7770's and thought I'd cream Battlefield 3 but I'm getting FPS drops down to 20 and under. Seems like my single 7850 plays this game better. Any tweaks I should consider ?


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post #2 of 19
Try putting mesh quality on low. It's basically draw distance and it has a huge impact on CPU use. I noticed huge drops as well running 7970+7950 crossfire (around 60 fps AVG). I changed mesh to low and my FPS stays 100+ and the game feels much more responsive. A funny side effect to low mesh setting that I run across every now and then is the enemy will still show at long distance although the box he's hiding behind will not be drawn - giving away his position.

Also when BF3 first came out I noticed it makes CONSTANT read/writes with the paging file and I could see this with the render.perfoverlay command (very eratic / not flat). I turned off my page file and the perf overlay flattened out.
Edited by nugget toes - 5/25/13 at 7:50am
post #3 of 19
Thread Starter 
Thanks bud I will try that thumb.gif
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post #4 of 19
Quote:
Originally Posted by dogbiscuit View Post

I crossfired a couple of 7770's and thought I'd cream Battlefield 3 but I'm getting FPS drops down to 20 and under. Seems like my single 7850 plays this game better. Any tweaks I should consider ?


CPU i5 3470s
8GB corsair vengeance.

are those 1GB version?

Quote:
Originally Posted by nugget toes View Post

Try putting mesh quality on low. It's basically draw distance and it has a huge impact on CPU use. I noticed huge drops as well running 7970+7950 crossfire (around 60 fps AVG). I changed mesh to low and my FPS stays 100+ and the game feels much more responsive. Another funny thing that I run across every now and then is the enemy will still show at long distance although the box he's hiding behind will not be drawn - giving away his position.

Also when BF3 first came out I noticed it makes CONSTANT read/writes with the paging file and I could see this with the render.perfoverlay command (very eratic / not flat). I turned off my page file and the perf overlay flattened out.

i guess ht helps. this is what i got with my hybrid stock with my i7 at 4.5 but only at 1080 ultra and 4msaa BF3 MP 64 full . . .

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post #5 of 19
Quote:
Originally Posted by rdr09 View Post

are those 1GB version?
i guess ht helps. this is what i got with my hybrid stock with my i7 at 4.5 but only at 1080 ultra and 4msaa BF3 MP 64 full . . .

On 48-64 player maps where a ton of data needs to be processed, I think HT is beneficial. Most websites benchmark CPUs only in the campaign mode of BF3 where HT doesn't get to stretch its legs and doesn't tell the whole story.
post #6 of 19
Quote:
Originally Posted by nugget toes View Post

On 48-64 player maps where a ton of data needs to be processed, I think HT is beneficial. Most websites benchmark CPUs only in the campaign mode of BF3 where HT doesn't get to stretch its legs and doesn't tell the whole story.

very true. the other thing is BF3 does not have an in-game bench. different maps and scenarios will yield varying results. the same with C3 or any other game as such.

i only tried crossfire to test 120Hz and also found out that BF3 runs just as smooth crossfired.
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post #7 of 19
Thread Starter 
Both 1GB versions yes. I shut off the motion blur because it seemed to be giving the worst fps drops, and that helped a lot.
Both GPU's are at 96-8% most of the time.

My monitors, BTW, are a Viewsonic 1920x1080 and a NEC 1280x1024 - I play the game on the Viewsonic of course. So I've got a few pixels to fill, but the 7850 seems to handle both monitors without issue.

I notice that 7770's have a 128 memory bus, and the 7850 has 256, so could that be a problem ?
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post #8 of 19
I would put textures to high and disable antialiasing deferred, should work fine with 1GB GPU:s.

About the HT, for me personally running a single 7950@1150/1500 it gives 2-7 frames more on average depending on map and minimums are generally little bit higher, but it run very smoothly on 2500k@4,5GHz as well.
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post #9 of 19
Thread Starter 
I've been looking round for coolers for one of them and you know what ? Why do they have so many different sizes for these things ?It should be easy enough to have the fitting holes the same width apart for just about all graphics cards, standardisation should be possible surely ?
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post #10 of 19
dog, is this your motherboard?

http://www.newegg.com/Product/Product.aspx?Item=N82E16813128550

if it is, then you are running one card at X4. that can hit performance a good deal.

edit: also, connecting more than one monitor will put a constant load on your gpu or gpus. it prevents them from idling causing them to get warmer. check GPUz or HwInfo64 for their clocks and see the current clocks.
Edited by rdr09 - 5/25/13 at 3:46pm
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