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Several questions about 4870X2 in crossfire

Last response: in Graphics & Displays
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November 23, 2009 7:47:11 AM

Hey. Specs in sig.

I wanna get 2 4870 X2s in crossfire and I got some concerns.

1. What kind of performance hit will the p45 board present? i.e 8x/8x pci-e slots, will it stutter/skip or just act as a framrate cap?

2. Will my ZM-1000-HP provide enough power for this system? It doesn't get very hot (heatpipes + good case + cool ambient :)  )

3. Can I mix the hardwire cables on the PSU with the modular cables on the one device? i.e a 8-pin hard with a six pin modular, for each card?

Thanks.
November 23, 2009 2:55:56 PM

you can mix and match modular and hardwired cables with no issues. i'm curious though why you want to go with 2 4870 x2s. you can get much more performance with far less electricity and heat going with newer generation hardware. from what i've seen in benchmarks a single 5870 will beat a 4870 x2. they're roughly the same price I'd get 2 of those an cross fire them, if you can find them in stock.
as for bottle necking on a x8 pcie interface, i woudln't worry much. while i'm sure with the right bench marking you'd be able to find a minor difference mostly due to latency, but it shouldn't be enough to cause any big issues for you. certainly not enough for you to notice in gaming.
a c 147 U Graphics card
November 23, 2009 3:17:06 PM

1. I can see a small impact form the x8 slots being these cards are dual GPU.

2. That will run them just fine

3. yes that should work.

Now my turn. Please take these suggestions and constructive criticism.

A) Why the 4870x2. They have been replaced in terms of the big daddy cards by ATI. The 5970 (aka 5870x2) is it's replacement and just knocks the 4870x2 out of the park. The single GPU 5870 outperforms the 4870x2 in most cases. If I were you, just get a single 5970, it will run as good as a dual 4870x2 setup, and consume FAR less power. Your setup will have heat issues, unless you have a FULL ATX case with LOTS of fans. TRUST ME they run HOT HOT HOT.

B) Are you limited in terms of location or where you can purchase them? Do you live in the US or another country. Where will you shop to get your equipment?

C) Why so much GPU power? Are you planning to run multiple monitors or super high resolutions? If you are running a single 1920x1200 monitor (in your signature) a single 5870 would do you just FINE. Trust me I have one and it run most everything maxed. At the very most I would get a single 5970.
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November 23, 2009 8:33:19 PM

I only planned on using the 4870 x2 as I can get a hold of 2 of them for less than the cost of 1 5870, otherwise i'd get a 5970, but that's simply too much.

I live in Australia, so EVERYTHING here is way more expensive compared to usa/uk.

And I hope to be able to play crysis with 8xaa 16xaf Very high DX10.
a c 147 U Graphics card
November 24, 2009 12:00:40 AM

Honestly I'd take the single 5870 over the two of those. But that is just me. You will have the raw power, but other than Crysis, what other game demands that power? Honestly I played the single player of Crysis, when I beat it, I never picked it up again. But its your deal.
November 24, 2009 6:10:36 AM

true, but i could probably get 3 4870x2s for the price of one 5870.
a b U Graphics card
November 24, 2009 6:21:33 AM

Why not get a single 4870x2 for now? I have 2 4870x2s, and honestly, the second one adds a ton of heat and power consumption, and you'll only notice the extra FPS in a few of the most demanding games.
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