Today is all about the Radeon HD 4870 X2, the same card we previewed last month but AMD is quietly announcing a few other products alongside it. The 4870 X2, internally referred to as R700, is a pair of RV770 GPUs on a single card - effectively a single-card, Radeon HD 4870 CrossFire (hence the X2 moniker). Like previous X2 cards, the 4870 X2 appears to the user and the driver as a single card and all of the CrossFire magic happens behind the scenes.

  ATI Radeon HD 4870 X2 ATI Radeon HD 4870 ATI Radeon HD 4850
Stream Processors 800 x 2 800 800
Texture Units 40 x 2 40 40
ROPs 16 x 2 16 16
Core Clock 750MHz 750MHz 625MHz
Memory Clock 900MHz (3600MHz data rate) GDDR5 900MHz (3600MHz data rate) GDDR5 993MHz (1986MHz data rate) GDDR3
Memory Bus Width 256-bit x 2 256-bit 256-bit
Frame Buffer 1GB x 2 512MB 512MB
Transistor Count 956M x 2 956M 956M
Manufacturing Process TSMC 55nm TSMC 55nm TSMC 55nm
Price Point $549 $299 $199


The benefit of single-card CrossFire is of course that you can use this single card on any platform, not just ones that explicitly support CF. Since CrossFire is supported on both Intel chipsets and AMD chipsets, it's a bit more flexible than SLI and the need for single-card CF isn't nearly as great as the need for single-card SLI.

Unlike most single-card multi-GPU solutions, the 4870 X2 is literally two Radeon HD 4870s on a single card. The clock speeds, both core and memory, are identical and this thing should perform like a pair of 4870s (which is pretty quick if you have forgotten). The only difference here is that while the standard Radeon HD 4870 ships with 512MB of GDDR5 memory, each RV770 on a X2 gets a full 1GB of GDDR5 for a total of 2GB per card.

...which leads us nicely into some of AMD's other products that will be coming out in the next month or so. There will be 1GB versions of both the Radeon HD 4870 and Radeon HD 4850.

Then at $399 we'll see a Radeon HD 4850 X2, which as you can probably guess is a pair of Radeon HD 4850 GPUs on a single card, but with 2GB of GDDR3 and not GDDR5 like the 4870 X2. As interesting as all of these cards are, we only have the 4870 X2 for you today, the rest will have to wait for another time. But it is worth noting that if you are interested in buying a Radeon HD 4870/4850 and keeping it for a while, you may want to wait for the 1GB versions as they should give you a bit more longevity.

Enough with being distracted by AMD's product lineup, let's talk about the competition.

Let's Talk Pricing


View All Comments

  • ZootyGray - Tuesday, August 12, 2008 - link

    Keys also goes overboard to find trouble.

    And lack of followup articles - as promised - where are they? Trouble only reported here with 780G has not been followed up as mentioned it would be - since last May. But the damage was done. Do we believe it or no?

    Credibility? nah.

    Bias? haha

    the ntel fanboys seem to like it - or employboys.

    And the ultimate recently 16 pages of praise for non-existent theoretical 2yrs out larrabeee rehash trash. Preceded by - we don't know anything about it at all. as dictated by ntel bs div.

    Biased much? haha

    This is dangerous market influence. How far does this go? How long has this been happening?

    Violating trust is pretty sad.
  • pattycake0147 - Tuesday, August 12, 2008 - link

    I've noticed the same bias recently. I've only been a member for a little over a year now and even in the short time the site has gone downhill. Reply
  • sweetsauce - Tuesday, August 12, 2008 - link

    Translation: I like ATI and you don't so im going to bitch. Even though my name is tech guy, i obviously have ovaries. I'm going to go cry now on ATI's behalf. Reply
  • jnmfox - Tuesday, August 12, 2008 - link

    Get over yourself. Pointing out facts isn't taking pot-shots.

    This is just what I was looking for in a review of the X2. The numbers tell the story. In the majority of cases the X2 isn't worth it, and until AMD & NVIDIA get proper hardware implementation of multi-GPU solutions it will most continue to be the case.

    To little performance increase for the large increase is cost.
  • skiboysteve - Tuesday, August 12, 2008 - link

    i completely agree with anand on this article. the lack of innovation from a company supposedly focusing on multi chip solutions is stupid

    although yes, it is really fast.

    and why cant they clock it lower at idle?
  • astrodemoniac - Tuesday, August 12, 2008 - link

    ... reviews I have ever seen here @ Anands. I am extremely disappointed with this so called "Review" ... hell, I have seen PREVIEWS that would put it to shame.

    Oh, and what in the hell did AMD do to you that you're so obviously pissed off at them?... are you annoyed they didn't give you preferential treatment to release the review earlier? man just go back to the unbiased reviews, we're buying graphic cards, not brands.

    It's like the guys writing the reviews are not gamers any more o_0

  • Halley - Wednesday, August 13, 2008 - link

    It's no secret that AnandTech is "managed by Intel" as a user put it. Of course every one must have some source of income to support their families and themselves but it's pathetic to show such blatant biasedness. Reply
  • TheDoc9 - Tuesday, August 12, 2008 - link

    Anandtech isn't about gaming anymore, it's about photography and home theater. And the occasional newest intel extreem cpu.

    I think Dailytech and the forums carry Anandtech these days...

  • DigitalFreak - Tuesday, August 12, 2008 - link

    "AMD decided that since there's relatively no performance increase yet there's an increase in power consumption and board costs that it would make more sense to leave the feature disabled. "

    In other words, it's broken in hardware and we couldn't get it working, so we "disabled" it.
  • NullSubroutine - Tuesday, August 12, 2008 - link

    You didn't even include test system specs or driver versions. Reply

Log in

Don't have an account? Sign up now