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Simple question to ask, probably harder to give a definitive answer :D
I have an Asus P5K-E motherboard and am considering switching to a 4850/4770 CF setup. I currently have a single 4870 512Mb. Would the x4 slot be a serverely limiting factor with performance using either of these cards?
Not being experienced with CF setups I've no idea how this affects performance...
cant crossfire a 48** with a 47**, needs to be the same first two numbers.
See chart: http://game.amd.com/us-en/content/im...ombo_chart.jpg
Will i think you read his post wrong, think he means he will sell the 4870 to buy 2x 4850 or 4770's but hes wondering if its worth it considering the bandwidth limitations of CF on his board(16x/4x)
Tbh unless their is a perticular reason you want to go CF i'd stick with your 4870 for now, it should be more then adaquete for most games on todays market at the moment. Plus if i was gonna go CF i'd stick another 4870 in their should quite happily outperform a 4890.
OOps, I read it as a 4850 with a 4770:(Quote:
Originally Posted by Hicks12
Sorry should have clarified, Hicks is right 2x4850 or 2x4770 :)
I have a corsair 550W VX...so was a little concerned about putting 2x 4870 under the hood, would surely be asking a bit much of the PSU considering they're meant to be quite power hungry under load...
Think the PSU is enough for 2x4870?
id stick it in, and see if it works, if anything does go pop just waranty the PSU.
I had a cheap 500w psu (ezcool i belive) and when i just had my hd4870 i went pop with in first 5 mins of crysis. just the PSU went. called scan and actually owned up to them me being silly etc. they just took it in gave me a refund and even sugested something that would work :D
besides theres no point of bothering with HD4850 / HD4770 the HD4870 is now around £100 and combine that with a £50 PSU yo will get a better performing system out off what you have than spending £200 on stand alone card
I would say that 4x would limit the performance if you were going to crossfire 4870's, mind you i had crossfire 4870's on my P5Q-E at 16/8x and both cards performed the same.
I'd recommend that you stay away from CF for now, i found the permance increase was in most games next to 0% and in games that are optimised for multi GPU setups (like cod4) the performance increase was massive, going from 92FPS to 250+FPS, But 92 is enough so why waste your money!. What im saying is not many games are Multi GPU optimized.
Unless you just want it for bragging right of course :D
For Supreme Commander (which is optimised, I've seen benches) and hopefully for ArmA2
From my experience minimal fps count increase going CF was noticable in STALKER only. Though I mostly play First Person Shooters.
I'd probably go with HD4870 or even HD4890. Single GPU card on ful;l speed slot is much better option.
BTW CF on that mainboard would definately suck. Second slot is connected via south bridge (added latency) and is quite slow.