Testing Methodology and System Setup

Sapphire Radeon HD 4850 X2 2GB Review - GTX 280 killer - Graphics Cards 67

GPU-Z sees the Sapphire Radeon HD 4850 X2 as a standard R700 design, which it really is, and indicates the same clocks and specifications we talked about on the first page.  The GPU runs at 625 MHz and the memory runs at 993 MHz GDDR3 though only 1GB is showing up on the screen since only a single is measured at a time. 

Testing Methodology

Graphics card testing has become the most hotly debated issue in the hardware enthusiast community recently.  Because of that, testing graphics cards has become a much more complicated process than it once was.  Before you might have been able to rely on the output of a few synthetic, automatic benchmarks to make your video card purchase, that is just no longer the case.  Video cards now cost up to $500 and we want to make sure that we are giving the reader as much information as we can to aid you in your purchasing decision.  We know we can’t run every game or find every bug and error, but we try to do what we can to aid you, our reader, and the community as a whole.

With that in mind, all the benchmarks that you will see in this review are from games that we bought off the shelves just like you.  Of these games, there are two different styles of benchmarks that need to be described.

The first is the “timedemo-style” of benchmark.  Many of you may be familiar with this style from games like Quake III; a “demo” is recorded in the game and a set number of frames are saved in a file for playback.  When playing back the demo, the game engine then renders the frames as quickly as possible, which is why you will often see the “timedemo-style” of benchmarks playing back the game much more quickly than you would ever play the game.  In our benchmarks, the FarCry tests were done in this matter: we recorded four custom demos and then played them back on each card at each different resolution and quality setting.  Why does this matter?  Because in these tests where timedemos are used, the line graphs that show the frame rate at each second, each card may not end at the same time precisely because one card is able to play it back faster than the other — less time passes and thus the FRAPs application gets slightly fewer frame rates to plot.  However, the peaks and valleys and overall performance of each card is still maintained and we can make a judged comparison of the frame rates and performance.

The second type of benchmark you’ll see in this article are manual run throughs of a portion of a game.  This is where we sit at the game with a mouse in one hand, a keyboard under the other, and play the game to get a benchmark score.  This benchmark method makes the graphs and data easy to read, but adds another level of difficulty to the reviewer — making the manual run throughs repeatable and accurate.  I think we’ve accomplished this by choosing a section of each game that provides us with a clear cut path. We take three readings of each card and setting, average the scores, and present those to you.  While this means the benchmarks are not exact to the most minute detail, they are damn close and practicing with this method for many days has made it clear to me that while this method is time consuming, it is definitely a viable option for games without timedemo support.

The second graph is a bar graph that tells you the average framerate, the maximum framerate, and the minimum framerate.  The minimum and average are important numbers here as we want the minimum to be high enough to not affect our gaming experience.  While it will be the decision of each individual gamer what is the lowest they will allow, comparing the Min FPS to the line graph and seeing how often this minimum occurs, should give you a good idea of what your gaming experience will be like with this game, and that video card on that resolution.

Our tests are completely based around the second type of benchmark method mentioned above — the manual run through.

System Setup and Comparisons

Pitting the competition for the Sapphire Radeon HD 4850 X2 was a bit more problematic than I initially thought.  The card currently sells for right at the $400 mark putting it squarely between the Radeon HD 4870 1GB and the Radeon HD 4870 X2 2GB.  That also is between the prices on the new GeForce GTX 260+ 896MB cards and the GTX 280 1GB.  Since I knew that that HD 4870 X2 would obviously outperform the HD 4850 X2, we decided to pit the HD 4850 X2 against the HD 4870 1GB and the two competing NVIDIA GeForce GTX 200 cards.

Test System Setup


Intel Core 2 Extreme QX9650


EVGA nForce 790i Ultra SLI Motherboard – NVIDIA GPUs
Intel DX48BT2 Motherboard – AMD GPUs


OCZ Technology 2 x 2GB DDR-1333

Hard Drive

Western Digital Raptor 150 GB – Review

Sound Card

Sound Blaster Audigy 2 Value

Video Card

Sapphire Radeon HD 4850 X2 2GB
Galaxy GeForce GTX 260+ 896MB
BFG GeForce GTX 280 1GB
AMD Radeon HD 4870 512MB

Video Drivers

NVIDIA Forceware 177.38 Beta
AMD Catalyst HD 4830 Beta
Power Supply PC Power and Cooling 1000 watt

DirectX Version

DX10 / DX9c

Operating System

Windows Vista Ultimate 64-bit

  • Bioshock
  • Crysis
  • Call of Duty 4 
  • World in Conflict
  • 3DMark06
  • 3DMark Vantage 

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