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Ati Sapphire Radeon HD 4870 Crossfire problem or what?! - Page 2

post #11 of 44
I would say your power supply would be holding back, I dont know this for sure (dont quote me) But I would say that maybe your other card might not be running with that lower end PSU.

Also I second that the TR-2s are really that good...
 
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post #12 of 44
Thread Starter 
I did some benchmark tests(PerformanceTest 7.0) for 3D Graphics, and the results were:
1 Graphics card 1838.5
2 Graphics cards 2136.3

Slight difference, could have been just a bad test.
Can it be my power supply? Like, what does that have to do with this? Note: with two cards my mobo runs 8x 8x bandwidth for PCE-E and one card is 16x.
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post #13 of 44
bandwidth on your mainboard won't kill performance that much, even at 4x. Your second card could just be getting not enough power, so it is struggling to work with what it's given.
Edited by Kratthew D. Kraids - 2/19/11 at 9:19pm
    
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post #14 of 44
Thread Starter 
Yea I believe your right, I re-ran the Benchmark with both GPU's again and I got the same result as 1 GPU.
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post #15 of 44
Thread Starter 
Is there a way to get thw power needed to my second gpu without changing my powersupply??
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post #16 of 44
you could get a seconday 5 1/4 bay PSU lemme find one for you.
    
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post #17 of 44
Thread Starter 
What is that an how much approximatly will I be paying? If its expensive then im better off getting a new power supply and selling my old
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post #18 of 44
Thread Starter 
I have this application called TechPowerUp GPUtool. I can test each card separately. Therefore, It's weird because if my second GPU isn't getting the power it needs, how come when I test each card in the fps test they both have the same results? Like, it is working, isn't it?
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post #19 of 44
Did anyone bother to look at his processor? Your processor is your bottle neck here.. I have a 4870 and I brought it into this computer from my last build and it felt like I bought a new video card!

An intel e5200 even overclocked is not going to run two of these video cards at their max, you would be fine running one- but that CPU would be somewhat bottle necking one 4870 let alone 2.

Put your money on a CPU upgrade, get a C2Duo or C2Quad with lots of L2 Cache

they are right about your PSU not being the best in the world, but chances are its running everything just fine and you dropping money on a better PSU could have been better spend buying a better processor. -me, been there done that.
Edited by Killam0n - 2/20/11 at 8:44am
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post #20 of 44
Thread Starter 
Quote:
Originally Posted by Killam0n View Post
Did anyone bother to look at his processor? Your processor is your bottle neck here.. I have a 4870 and I brought it into this computer from my last build and it felt like I bought a new video card!

An intel e5200 even overclocked is not going to run two of these video cards at their max, you would be fine running one- but that CPU would be somewhat bottle necking one 4870 let alone 2.

Put your money on a CPU upgrade.
What exactly do you mean? Putting aside the CPU, I did some benchmark tests for ONE 4870, and it gave me the same results as that for TWO 4870's. Benchmarking was for the Graphics cards though not the CPU.
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