Radeon HD 4850 X2 

Released November, 2008
  • 625 MHz
  • 1 GB GDDR3

Sapphire's heatsink assembly is quite big and consists of two independent heatsinks that look a bit like CPU coolers.
by techPowerUp! (Nov, 2008)
Sapphire has chosen to use their own cooler design with two independent fans over the AMD reference cooler.
by techPowerUp! (Nov, 2008)

Benchmarks Real world tests of the Radeon HD 4850 X2

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Radeon HD 4850 X2

Cloud Gate Factor Data courtesy FutureMark

Radeon HD 4850 X2

Reviews Word on the street for the Radeon HD 4850 X2

This frequency is the highest clock frequency at which both GPUs are stable.

What People Are Saying Give it to me straight


One is that ATI has to create a CrossFire profile for every single game to benefit from their dual-GPU technology.
by techPowerUp! (Nov, 2008)
The HDCP output then features the usual HDCP+Audio, which allows easy setup of a media PC.
by techPowerUp! (Nov, 2008)
So if you play any windowed games for whatever reason then the HD 4850 X2 will perform exactly like a HD 4850 single card.
by techPowerUp! (Nov, 2008)


The actual 3D performance gained is 15.
by techPowerUp! (Nov, 2008)
You may combine two of these cards for even more performance in CrossFireX.
by techPowerUp! (Nov, 2008)
I have never had a card that noisy on my test bench.
by techPowerUp! (Nov, 2008)

Multi card

You can also combine this card with a single HD 4850 (or HD 4870) card for triple CrossFire.
by techPowerUp! (Nov, 2008)
Another factor to consider is that CrossFire does not work in windowed 3D.
by techPowerUp! (Nov, 2008)
CrossFire does not work in windowed 3D.
by techPowerUp! (Nov, 2008)


Once you successfully master the process of getting the card to run at matching clock speeds, you can achieve some nice performance gains; in our case about 15.
by techPowerUp! (Nov, 2008)
The GDDR3 memory chips are made by Samsung and carry the model number K4J10324QD-HJ1A.
by techPowerUp! (Nov, 2008)
To achieve optimum performance you must ensure that both GPUs run at the same core and memory clocks.
by techPowerUp! (Nov, 2008)


Motherboard:Gigabyte P35C-DS3RIntel P35Memory:2x 1024MB A.DATA DDR2 1066+ CL4Harddisk:WD Raptor 740ADFD 74 GBPower Supply:OCZ GameXStream 700WSoftware:Windows XP SP2Drivers:NVIDIA: ForceWare 177.83ATI: Catalyst 8.10HD 4850 X2: 8.542 All video card results were obtained on this exact system with the exact same configuration.
by techPowerUp! (Nov, 2008)

Specifications Full list of technical specs


GPU brand ATI
GPU name R700
Market Desktop
Clock speed 625 MHz
Is dual GPU Yes
Reference card None

raw performance

Shading units 1,600
Texture mapping units 80
Render output processors 32
Compute units 20
Pixel rate 20 GPixel/s
Texture rate 50 GTexel/s
Floating-point performance 2,000 GFLOPS


Memory clock speed 995 MHz
Effective memory clock speed 1,990 MHz
Memory bus 512 bit
Memory 1,024 MB
Memory type GDDR3
Memory bandwidth 127.36 GB/s

noise and power

TDP 250W
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