ATI Radeon HD 4770 In CrossFire: Unbeatable At $220

Radeon HD 4770s In CrossFire

So how much graphics muscle are you really getting for $220, and how does that compare to the competing single-GPU solutions?

Two Radeon HD 4770s give you 1,280 total shader processors, two 512 MB GDDR5 frame buffers (each on a 128-bit bus), 32 total ROPs and the ability to filter up to 64 textured pixels per clock. Each board in the CrossFire configuration runs a 750 MHz core clock and memory at 800 MHz—effectively 3,200 MT/s.

Why is CrossFire so gosh-darned viable right now? For several generations of chipsets dating back to the 955X Express, Intel platforms have supported the multi-card rendering technology. AMD chipsets dating back to the Radeon Xpress 200 also extend support. So, there’s a huge install base of core logic and motherboards that are compatible.

In contrast, Nvidia has historically limited its SLI technology to Nvidia’s own AMD-/Intel-based chipsets. It was only recently made available on another vendor’s platform via licensing (Intel’s X58). Clearly, Nvidia is realizing that a protectionist policy isn’t the way to go. In fact, we even heard of one motherboard vendor whose budget X58 boards originally didn’t support SLI, were BIOS-hacked to enable it, and then worked-through with Nvidia on a proper implementation—all without having to pay for the license!

How about the oft-mentioned (by Nvidia) concern that, because ATI doesn’t have as close a relationship with game developers—specifically those involved in its TWIMTBP program—that CrossFire is riddled with compatibility issues? There’s actually some validity to such a worry, especially if you enjoy picking up games as soon as they're released. We've seen titles, such as FEAR 2, where CrossFire compatibility is specifically listed as a known issue. Fallout 3 with quad-GPU CrossFire can also be problematic, according to ATI's own Catalyst release notes.

At the same time, none of the games in our test suite gave us trouble. CrossFire isn’t perfect, but after seeing what a pair of 4770s can do slung together, you’ll want to reconsider your reservations.

Swipe to scroll horizontally
Header Cell - Column 0 Radeon HD 4890Radeon HD 4870Radeon HD 4770 CrossFireGeForce GTX 280GeForce GTX 260 C216
Manufacturing Process55 nm TSMC55 nm TSMC40 nm TSMC65 nm TSMC55 / 65 nm TSMC
SPs800800640 x 2240216
Core Clock850 MHz750 MHz750 MHz602 MHz576 MHz
Shader Clock850 MHz750 MHz750 MHz1,296 MHz1,242 MHz
Memory Clock975 MHz GDDR5900 MHz GDDR5800 MHz GDDR51,107 MHz GDDR3999 MHz GDDR3
Frame Buffer1 GB1 GB / 512 MB512 MB x 21 GB896 MB
Memory Bus Width256-bit256-bit128-bit x 2512-bit448-bit
ROPs161616 x 23228

Power And Heat

The Radeon HD 4770 earned praise for its 40 nm technology and resulting cut in power consumption. Indeed, it uses the least power at idle and under load of any other graphics card we tested here.

But what happens when you add a second board in CrossFire? As expected, power consumption jumps significantly. At idle, the two 4770s use more power than any of the single-GPU solutions. Under load, however, the 40 nm RV740 retains its advantage and ducks in under the Radeon HD 4890 and Radeon HD 4870 1 GB cards, using more power than the GeForce GTX 260 Core 216.

If you were looking for more information on the 40 nm process’ effect on GPU temperature, here you go. These were all measured through GPU-z after 10 minutes of idle and then a series of looped 1920x1200 Crysis runs in a window.

You can see that a lone Radeon HD 4770 is the coolest of ATI’s cards at both idle and under full load. Interestingly enough, though, each board required a slightly different fan speed in order to achieve its temperatures. We'll see if these results correspond to overclocking in just a bit.

Chris Angelini
Chris Angelini is an Editor Emeritus at Tom's Hardware US. He edits hardware reviews and covers high-profile CPU and GPU launches.
  • curryj02
  • cangelini
    Working on getting the drop-down or ToC on every page. Sometimes things are changed without advanced notice. Trying to get a solution for you guys!
  • crisisavatar
    curryj02BRING BACK THE DROP DOWN MENU FOR NAVIGATION!! ARGHHHH!!Seriously, is a hassle to browse without it.
  • Spathi
    This RSS feed has the Intel logo??? Larrabee on the mind? ahaha
  • Summer Leigh Castle
    Great article. Just for kicks, how do the xfires of the 4830 and 4850 compare to the xfire 4770?

    How about a dual column menu table? My mobile browser doesn't like to work with drop-down menus. I know, just nick picking like everyone else. :D
  • mrubermonkey
    I have already mentioned the drop down issue, but I am mentioning it again for emphasis. Consider Bert Lance's saying, "If it ain't broke, don't fix it." By the way, nice article.
  • Ciuy
    what drop down menu`s ? :p didnt notice anything lol

    i like old school navigation :D
  • xbsoft
    The other day I was trying to prove to my brother that 2 ATI 4770's would outperform anything in its price range and my brother didn't agree with that... lol I can't wait to show him the article.

    Unfortunately, he already bought a 4850 card which he should be okay for now, I guess.

    Anyways, great article. I really enjoyed it. :)
  • ta152h
    Just put in the URL to jump to the page you want, for now.

    For example -,2288-3.html will get you to page three.,2288-5.html will get you to page five, etc...
  • quickwind
    Hmmm I wonder how three of these would scale together. Nice article as well, very interesting how this compares to the other cards