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Bottleneck on a p2 965 / Formula IV

post #1 of 7
Thread Starter 
Hi.

Im getting a new psu tomorow. The reason beeing im getting another 5850 possibly also a third for Trifire. Im Just a bit confused. Reading bout Bottlenecking around OCN im starting to worry that i might need to switch to a newer setup such a SANDY setup. Would my 965 on my ASUS Formula IV board having some issues bottlenecking at CF or TF setup?

Thx.
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post #2 of 7
Well your 965 only has 4 cores and a slower architecture then some newer intel offerings. At 3.8ghz you should experience little to no bottleneck when crossfiring two 5850's. However, when tri-firing you will be bottlenecked in games and benches because the cpu just wont be able to keep up with the gpu's. While sandy bridge will decrease the bottleneck, it will still be present as very few cpu's can keep up with the graphics cards. I would wait for the 8 core bulldozers in two months before you grab a 3rd 5850.
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post #3 of 7
Just get the 1 extra 5850 for now.

As for bottlenecking it depends on the game and settings. With crossfire 5770s, some games will max both cards (Borderlands, Metro) and other games (Dawn of War II, Starcraft 2) are cpu limited and will not full utilize the gpus. Some games will have sections of both cpu and gpu bottlenecks (Mass Effect 2 with AA forced in CCC). A program like msi afterburner that tracks gpu utilization % in combination with task manager is useful in determining bottlenecks in games.

Your current PSU will probably handle 2 5850s and your 965, though I am not sure about your WC setup. Would ask in the psu forum whether yours is sufficient / what to get unless you already have a specific upgrade picked out.
Edited by RichardS - 4/17/11 at 6:55pm
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post #4 of 7
If you can get to 4ghz or better you wont have a bottleneck or it will be very small with 2 5850's and you're 965. Trifire 5850's might give you a cpu bottleneck though. Key is to get your CPU and Northbridge as high as you can get it. I also find i get better results with my games if i have a good speed on my ram over the tightest timings i can get....like a trade off.

When you overclock your CPU you really have to overclock everything.
Edited by huhh - 4/17/11 at 6:45pm
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post #5 of 7
How has Balla not made it to this thread yet?

Is he slacking off?

Probably would be fine Tri-Fire, but only if you are running an extreme resolution. IE At least 2560x1600 and quite frankly if you are running that high or higher with an eyefinity setup then it would be better to go with the newer cards with more Vram.

For a single 1080 or 1200p monitor, two 5850's should be plenty and should not be horribly bottlenecked.
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post #6 of 7
Thread Starter 
The main reason for the new PSU is that my current 650w isn't sufficient enough to run all my stuff along with my WC. but with the new 1000w CM pro, there should be room enough to all kinds of things.

But thx for all the answers. Im gonna get just another 5850 for now and wait for the BD. Going to be exiting to see how well it runs on the 890fx chipset. Anyhow + rep for everyone.
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post #7 of 7
Quote:
Originally Posted by Johnsen View Post
The main reason for the new PSU is that my current 650w isn't sufficient enough to run all my stuff along with my WC. but with the new 1000w CM pro, there should be room enough to all kinds of things.

But thx for all the answers. Im gonna get just another 5850 for now and wait for the BD. Going to be exiting to see how well it runs on the 890fx chipset. Anyhow + rep for everyone.
Yeah I'm excited to see how it runs on my Crosshair.
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