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Sapphire Radeon7950 Crossfire Help

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December 5, 2012 4:49:08 AM

Hi all,

I'm really stumped at this new crossfire setup.

Here's my specs:

AMD FX 4170 @ 4.2GHZ
2x Sapphire Radeon 7950's factory clocked to 925/1250 memory
16gb DDR3 Ram @800mz
750 Powerwat supply
120mm liquid CPU cooling




I bought the second 7950 after seeing many reviews that the FPS was almost doubled in games like BF3, etc while running in crossfire. I havent been able to get much of a performance increase at all except for in 3dmark, and I'm wondering if this forum can help. I also see a problem that I can't seem to fix with GPU-Z displaying different drivers. I actually am receiving worse FPS in BF3 with 2 7950's than with 1, but 3d mark scores shot to 14k graphics and 9400 overall with crossfire from 7200 overall with just 1 7950. So stumped.

Heres the GPU problem that I noticed with the drivers:

http://gpuz.techpowerup.com/12/12/05/28k.png
http://gpuz.techpowerup.com/12/12/05/cex.png

See the different drivers and allowable bus width / bandwith? Strange. I have went to device manager and clicked update driver for both 7950's, as well as looked at the details, and the drivers say the same.. But GPU-Z says differently. Also, in AMd overdriver, when I look at the second card, I don't get any temperature readings, mhz readings etc. It just says 0 for everything.

But msi afterburner shows both cards being utilized basically equally during 3d mark. Soon as I load BF3 however though, FPS is horrible and spiky. Often, it will spike from say 40 fps down to 0 out of nowhere, then straight back up. But the FPS overall is worse then with just 1 card. I also noticed that the spikes occur much more around explosions, and in empty servers, the FPS might be slightly better in crossfire than with just 1 card. But as soon as u throw explosions, the FPS goes to spiky garbage. Is there possibly a memory bottleneck for me with running 2 cards? Please help as this is very frustrating!!! How can my 3d mark score nearly double FPS (from like 22 to 38 in different tests) but hurt my BF3 fps? Either way something feels astray considering the GPU-Z driver reading.

Best,

Dan








December 5, 2012 4:53:32 AM

dbaker1989 said:
Hi all,

I'm really stumped at this new crossfire setup.

Here's my specs:

AMD FX 4170 @ 4.2GHZ
2x Sapphire Radeon 7950's factory clocked to 925/1250 memory
16gb DDR3 Ram @800mz
750 Powerwat supply
120mm liquid CPU cooling




I bought the second 7950 after seeing many reviews that the FPS was almost doubled in games like BF3, etc while running in crossfire. I havent been able to get much of a performance increase at all except for in 3dmark, and I'm wondering if this forum can help. I also see a problem that I can't seem to fix with GPU-Z displaying different drivers. I actually am receiving worse FPS in BF3 with 2 7950's than with 1, but 3d mark scores shot to 14k graphics and 9400 overall with crossfire from 7200 overall with just 1 7950. So stumped.

Heres the GPU problem that I noticed with the drivers:

http://gpuz.techpowerup.com/12/12/05/28k.png
http://gpuz.techpowerup.com/12/12/05/cex.png

See the different drivers and allowable bus width / bandwith? Strange. I have went to device manager and clicked update driver for both 7950's, as well as looked at the details, and the drivers say the same.. But GPU-Z says differently. Also, in AMd overdriver, when I look at the second card, I don't get any temperature readings, mhz readings etc. It just says 0 for everything.

But msi afterburner shows both cards being utilized basically equally during 3d mark. Soon as I load BF3 however though, FPS is horrible and spiky. Often, it will spike from say 40 fps down to 0 out of nowhere, then straight back up. But the FPS overall is worse then with just 1 card. I also noticed that the spikes occur much more around explosions, and in empty servers, the FPS might be slightly better in crossfire than with just 1 card. But as soon as u throw explosions, the FPS goes to spiky garbage. Is there possibly a memory bottleneck for me with running 2 cards? Please help as this is very frustrating!!! How can my 3d mark score nearly double FPS (from like 22 to 38 in different tests) but hurt my BF3 fps? Either way something feels astray considering the GPU-Z driver reading.

Best,

Dan


The more I read, the more I feel like this is a CPU bottleneck that's causing the issues. Should I have gone with the FX8350?
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Anonymous
December 5, 2012 4:57:03 AM

dbaker1989 said:
The more I read, the more I feel like this is a CPU bottleneck that's causing the issues. Should I have gone with the FX8350?

yes because a cpu bottleneck is exactly your problem.
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December 5, 2012 5:30:35 AM

whats up with the different bus and band widths on these 2 cards? is that normal for newer gen cards? ive never seen that before.

do both cards run properly when plugged into the first pci-e port without the second card installed?
have you tried any other games?
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Anonymous
December 5, 2012 5:31:59 AM

dbaker1989 said:
You're not being sarcastic, right?

If CPU bottleneck is the problem, would the FX8350 fix this? I have an AM3+ motherboard and I don't want to have to change unless I have to.

This is my mobo:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

not really being sarcastic.

a FX-4170 gets around a G860/i3-2100 in gaming. going for an FX-8350 will be a substantial upgrade towards an i5 and would relive your bottleneck problem.

i'll show ya this but it isn't the greatest comparison because there is a 4100 instead of your cpu:


see at the bottom of the list where there is no difference between the two lowest resolutions, like how the 4100 is 67 fps for both? that is a severe bottleneck. now go up the list and see the large difference for the 8350 (75 and 85 fps) no bottleneck.

now all amd cpu will bottleneck before an intel:


but since you cannot upgrade your whole platform; i think your best option is getting a FX-8350.

images from:
AMD FX 8350 - 8320 - 6300 and 4300 CPU performance review
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December 5, 2012 5:34:19 AM

ShadyHamster said:
whats up with the different bus and band widths on these 2 cards? is that normal for newer gen cards? ive never seen that before.

do both cards run properly when plugged into the first pci-e port without the second card installed?
have you tried any other games?


I'm not sure, but I'm also not sure its something to worry about considering MSI is showing both cards as working, and on one boot, the drivers and everything showed the same but I still had the issue.

I will be driving to fry's tomorrow to get a 8350
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December 5, 2012 5:36:42 AM

ShadyHamster said:
whats up with the different bus and band widths on these 2 cards? is that normal for newer gen cards? ive never seen that before.

do both cards run properly when plugged into the first pci-e port without the second card installed?
have you tried any other games?


Also I have tried other games, but only Farcry 3 today. Looked great, but again, had some frame issues/spiking.

3d mark is definitely reflecting that i'm getting the graphical power of 2 cards, but i think this 4170 is causing issues and freezing games easier with crossfire than without.
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December 5, 2012 5:43:44 AM

Also I should note that ever since installing the second 7950, even though my graphics on 3dmark shot wayy up (to like 14.3k), the physics scores have actually been less. Further making me feel these two cards are stressing the CPU too much
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December 5, 2012 6:22:12 AM

After doing some additional processor research, I'm really bent on going with an Intel series, possibly i7 if you guys suggest it.

Luckily, I ordered my motherboard on newegg recently and can still RMA it...

So here's my question since fry's is a two hour drive each way for me tomorrow..

RMA my current AM3+ mobo & 4170 & get tomorrow at fry's:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

+ an intel i5 or i7 (would be looking to the same price range as an FX8350, $200-$250 max...)
I see that Intel Core i5 3570K Boxed 3.4GH are benching slightly better on many games than the fx 8350.

or simply keep my current mobo:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
and get the FX8350

also, if I went with the former, would there be a significant reason to upgrade to this mobo as supposed to the other?
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I really feel like intel might be the better option since i decided to crossfire. If I get the 8350, I don't want to be let down. I'd rather go through the RMA process with newegg & just buy from fry's tomorrow an lga 1155 socket mobo with crossfire if it's going to be inherenty better. But this site is saying Fx8350 is better than a lot of intels:

http://www.cpubenchmark.net/cpu_lookup.php?cpu=Intel+Co...

Please advise i'll be making the trip in like 9 hours.

Thanks all!
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Anonymous
December 5, 2012 9:46:36 AM

the cpu benchmark site is not very good for comparing cpus. it uses synthetic benchmarking which isn't reliable for real world performance.

if you are picking up a i5 from fry's i just looked and this board is pretty reasonable and reliable
Asus P8Z77-V LX for $110 after rebate. however it may not be available at your store . .

the MSI Z77A-GD55 that you mentioned isn't bad either. you really don't have to get a asrock exteme6 motherboard if it goes out of your "unexpected" budget.

i don't want to sound like an intel fanboy though unless someone can chime in and have a 8350 Xfired without any problems, i think your safest bet is to get an i5 . .
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December 5, 2012 3:11:04 PM

well whether you get an i5 or i7 or 8350 so long as it gets fixed it's all fine, but try checking on how much you would be spending. oh and go ahead if you really want to and can spend the money,
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December 5, 2012 3:36:01 PM

dbaker1989 said:
After doing some additional processor research, I'm really bent on going with an Intel series, possibly i7 if you guys suggest it.

Luckily, I ordered my motherboard on newegg recently and can still RMA it...

So here's my question since fry's is a two hour drive each way for me tomorrow..

RMA my current AM3+ mobo & 4170 & get tomorrow at fry's:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

+ an intel i5 or i7 (would be looking to the same price range as an FX8350, $200-$250 max...)
I see that Intel Core i5 3570K Boxed 3.4GH are benching slightly better on many games than the fx 8350.

or simply keep my current mobo:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
and get the FX8350

also, if I went with the former, would there be a significant reason to upgrade to this mobo as supposed to the other?
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I really feel like intel might be the better option since i decided to crossfire. If I get the 8350, I don't want to be let down. I'd rather go through the RMA process with newegg & just buy from fry's tomorrow an lga 1155 socket mobo with crossfire if it's going to be inherenty better. But this site is saying Fx8350 is better than a lot of intels:

http://www.cpubenchmark.net/cpu_lookup.php?cpu=Intel+Co...

Please advise i'll be making the trip in like 9 hours.

Thanks all!


i7 = no no, not for what you are using the computer for, you want an i5 3570k, with a Z77 motherboard.

Here: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Thats a good Motherboard, give us a budget, and we will whip up something good for you.

I definitely saw downflaws in your build, 16gb of RAM? 2x 7950's with an AMD Processor? I nearly spewed my coffee all over my screen!

Anyway, Heres a budget motherboard: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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December 5, 2012 10:28:39 PM

dbaker1989 said:
I am leaving frys right now, decided to spoil myself a bit and got the i73770k wit the http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Why do you not recommend the i7? And what's wrong with my ram


The i5 3570k does any gaming task the exact same as an i7, they perform the exact same in games.
The RAM is butt stupid, you don't need 16 gigs of RAM, seeing on how you spent ALL THAT MONEY on everything else, except on the processor, which really bugs me, because you could have had a really awesome computer from the start, all the RAM you will ever need when gaming is 8.
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December 6, 2012 1:08:38 AM

Kiowa789 said:
The i5 3570k does any gaming task the exact same as an i7, they perform the exact same in games.
The RAM is butt stupid, you don't need 16 gigs of RAM, seeing on how you spent ALL THAT MONEY on everything else, except on the processor, which really bugs me, because you could have had a really awesome computer from the start, all the RAM you will ever need when gaming is 8.


Well I appreciate the response, but ram is dirt cheap.

I definitely made a rookie mistake on the initial processor and mobo, but lesson learned.

I just ran 3d mark completely unclocked first time on a fresh reformat with this i7 and am blown. 12.5k 3dmark
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Anonymous
December 6, 2012 1:39:06 AM

^ sweet!
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December 7, 2012 5:47:53 PM

Thanks loon, loving the new setup.

With my thermaltake 2.0 performer I can OC the processor to 4.6 and my ram to 1600 and am smooth as butter. Ran prime95 for 12 hours lastnight and max temp was 81 degrees. So happy!

This is my ram btw. I realize I could have spent more $$ on speed with 8gb, but I don't feel this is all that bad:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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December 7, 2012 5:48:55 PM

Best answer selected by dbaker1989.
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