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Crossfire 4870's Vs. Single 5850

post #1 of 12
Thread Starter 
So, right now I am running two Diamond Radeon HD 4870's in Crossfire instead of my single 5850. What was bugging me, was that GPU-Z reports that both graphics cards are running at 8x. I am using my Extreme4 motherboard, isn't it supposed to be 16x, 8x?
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post #2 of 12
It will be 16x when running one gpu, and drop to 8x/8x when running two. With cards like those, the bandwith really doesn't matter.
post #3 of 12
Thread Starter 
Quote:
Originally Posted by pangolinman View Post
It will be 16x when running one gpu, and drop to 8x/8x when running two. With cards like those, the bandwith really doesn't matter.
Oh, cool. Haven't really messed with Crossfire very much before. How much better do you think these are compared to my Sapphire 5850? I might not run them for too long though cause wow they use so much power. Comp idles at 205W
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post #4 of 12
Unfortunately, as pangolinman said, it's 8x/8x. However, there is absolutely no reason why it should make a difference. If your cards were somehow running at 16x/16x or 16x/8x, you wouldn't notice a difference between that and 8x/8x because the bandwidth of the 8x is greater than the saturation of the cards.
 
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post #5 of 12
A good amount increase, but honestly, I would use the 5850, as unless i am mistaken, it has 1gb of vRAM vs 512mb on the 4870s, and running out of vRAM makes a game unplayable.

If your samsung 23" from your sig is 1080p, use the 5850. If less, try the 4870s.
post #6 of 12
I'd be more concerned about the power supply. You are pushing the limits of the ea500
    
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post #7 of 12
Thread Starter 
Quote:
Originally Posted by pangolinman View Post
A good amount increase, but honestly, I would use the 5850, as unless i am mistaken, it has 1gb of vRAM vs 512mb on the 4870s, and running out of vRAM makes a game unplayable.

If your samsung 23" from your sig is 1080p, use the 5850. If less, try the 4870s.
For now, I am testing them on my 1440x900 monitor. And yeah I normally game on my Samsung, and it is 1080p. The other thing is power consumption since I already have 3 comps that run 24/7. I thought it might be fun though to try out the 4870's in Crossfire, toasty buggers though
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post #8 of 12
Thread Starter 
Quote:
Originally Posted by daydream99 View Post
I'd be more concerned about the power supply. You are pushing the limits of the ea500
oh haha forgot to mention, I am using them on an Antec True Power 650 Although the peak power consumption was 385W
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post #9 of 12
Quote:
Originally Posted by Pentium-David View Post
oh haha forgot to mention, I am using them on an Antec True Power 650 Although the peak power consumption was 385W
Ok, you're fine IIRC 4870x2 >5850, so xfire 4870 should yield the same result.
    
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post #10 of 12
Thread Starter 
What is a good GPU benchmark tool I can use to compare the two setups?
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Keeps me warm
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CPUMotherboardGraphicsRAM
Core i5 2500K @ 4.4GHz Asus Sabertooth P67 HIS IceQ Radeon HD 7950 3GB 16GB G.Skill Ares @ 1600MHz 
Hard DriveCoolingOSMonitor
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Thortech Thunderbolt 650W Antec 200 
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