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Thread: HD4870X2 vs. Crossfire HD4870?

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    Default HD4870X2 vs. Crossfire HD4870?

    Hi guys,

    As is common with a lot of us when we are building up the money for our new system, I have once again changed my mind on what I will be getting for my new system. In light of the recent information that AMD is going to be releasing their new AM3 platform in February/ March, I have decided that I am going to picking one up. Not only for reviewing purposes, but because I will be able to get a 3.0 GHz Phenom II quad core for much less than I will be able to Intel's 3.0 GHZ, and both have unlocked multipliers.

    Now, the purpose of starting this thread is for me to find out how best to spend my money. I am either looking at getting 2 Visiontek HD4780's to run in crossfire mode, or a single HD4870X2. I am wondering what I will get the better performance out of.

    Now, heat is not going to be an issue, because I will be water cooling the graphics cards (along with the chipsets and mosfets in the same loop, if I can find compatible ones for my AMD board). Also, I already understand that both of the chips on the X2 run at 8x pci-e speeds, and combined they make 16x. Both of the 4870's would be running at 16x, because I am planning on running the 790FX chipset instead of the 790GX. Obviously, price-wise ($100 less for the card, and 1 less GPU block), the X2 is the better choice, but I want to know perfomance-wise.

    So, now that I have gotten rid of a few of the negatives that I am sure that would have popped up, what would be the better option?
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    Default

    well the bridge chip on the X2 is 16X by itself i think, but thats irrelevant. overall the X2 outpreforms 4870's the 512 MB model. personaly if i did it again i would have waited for 1 X2 im not sure on the prices but the X2 uses less power that 2 4870's. The best par tho is that when X2's go on clearance you can buy another one and run quadfire.
    http://img246.imageshack.us/img246/5522/881217549921tl2.png

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    Default

    Jeremy

    you should think about the 4850 X2 for $299 each

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    Default

    Other than GPU clock speeds, is there really that much difference between two?

    Most of the ones I've seen run roughly the same Memory clock speeds, and both have the same number of shaders. If there is really no other significant difference other than price tag, and saying you own the latest and greatest, then I don't see why not to go with the HD4850X2.
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    I think the 4870x2 just a little bit faster than 2x 4870. Check out this page from Anand. But, IDK, some of his performance #'s are so inconsistent it hard to believe. Somtimes they are equal and sometimes 4870x2 is blowing 2x 4870 out of the water. This one from Tomshardware.com is a bit dated but shows the comparison you are inquiring about. Some of his #'s are wierd too, but the 4870x2 vs 2x 4870 debate is close, maybe leaning a hair on the 4870x2's side.

    Then checkout this article. That ones says its hard recommending anything pricier than a pair of 4850's right now based on diminishing returns from more expensive hardware. You can buy 2x 4850 for less than one 4850x2 right now. From some of the charts at Tom's the gameplay difference is negligible.

    I dont know exactly the physical difference between 4870 & 4850, but gaming and benching is a little bit ~ 10-15% FPS or ~1-2000 points in 3Dmark06. I have 2x 4850 in Crossfire and it good enough for all games I have tried (Far Cry 2, Red Alert 3, TmNations, CoDWaW) on 1920x1200 with all settings maxed except AA. My friend has 1 4870 and it is slower but still really good for gaming.

    I think it depends on what you want to do with it all and what resolution screen you plan to run it on.

    If you want to game lightly on lesser resolutions, preserve your cash and have more projects to do then buy smaller upgrades more often, maybe a single 4870 will get you by for the next 6 months. If you want to build a custom OC rig where you pay extra for full cover WC blocks you might want the best of the best. Then get a 4870x2 2GB and keep it for a couple years.

    Or you could wait for ATI's next best thing, when ever that comes out. It might be really badass. If you wait for AM3 anyway, then you can see if it is out by then. Or is AM3 like the "spider' where they mean the CPU/chipset/gpu combo?

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    ATI's "next big thing" is rumoured for this Spring.

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    which means that the prices for the 48xx series should be dropping soon as well. That is great news! Thanks Jake.

    Anyone been able to find a GPU WC block for the 4850X2? Would the Swiftech Caldera 4870X2 fit the 4850X2?
    Last edited by shattered.likeness; 15-01-2009 at 14:26.
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