Radeon HD 4870 And HD 4870 X2 Compared
In the following direct comparisons, we will provide a more detailed analysis of the advantages of the X2 for different games and resolutions. In this analysis, we compare the frame rates (fps) and give them as a percentage that shows the gain or drop in performance in each case. The first comparison addresses the old question: is a single-chip card enough, do you need CrossFire, and how much do you gain from a second graphics chip?
Assassin’s Creed runs absolutely perfectly with the Radeon HD 4870. A slight increase can only be seen above 1920x1200 pixels with anti-aliasing. But you don’t really need a dual-chip card when the boost is only 12.6%.
|Assassin’s Creed in fps||12800xAA||16800xAA||19200xAA||12804xAA||16804xAA||19204xAA||Overall|
|HD 4870 X2 8.10 QX@3.67||65.4||66.9||67.5||51.3||52.2||52.8||356.1|
|HD 4870 8.10 QX@3.67||69.0||68.3||65.6||51.8||51.0||46.9||352.6|
|Performance difference in percent||-5.2||-2.0||2.9||-1.0||2.4||12.6||1.0|
Call of Duty 4 can be played smoothly with a single-chip card. The dual-chip card raises performance to a whole new level, though—the gain of 62% to over 100% is gigantic and there should not be any shakiness left even in missions with heavy graphics demands.
|Call of Duty 4 in fps||12800xAA||16800xAA||19200xAA||12804xAA||16804xAA||19204xAA||Overall|
|HD 4870 X2 8.10 QX@3.67||276.2||265.4||226.5||239.3||199.9||177.1||1384.4|
|HD 4870 8.10 QX@3.67||170.2||140.0||114.8||125.7||101.0||87.4||739.1|
|Performance difference in percent||62.3||89.6||97.3||90.4||97.9||102.6||87.3|
In Crysis, a dual-chip card pays off in high resolutions with anti-aliasing turned on. After more than a month of optimizing CrossFire, Crysis has finally become faster and benefits from the two HD 4870 X2 GPUs. At lower resolutions, the CPU limits performance, determining the maximum frame rate.
|Crysis High in fps||12800xAA||16800xAA||19200xAA||12804xAA||16804xAA||19204xAA||Overall|
|HD 4870 X2 8.10 QX@3.67||34.2||31.1||31.2||31.8||29.1||29.1||186.5|
|HD 4870 8.10 QX@3.67||38.2||34.5||31.8||31.5||21.9||18.6||176.5|
|Performance difference in percent||-10.5||-9.9||-1.9||1.0||32.9||56.5||5.7|
With the highest picture quality and anti-aliasing, you really need twice the graphics power. The gain at higher resolutions with AA is increased even more through the larger graphics memory of 2 x1 GB, which is the reference spec for AMD’s Radeon HD 4870 X2. If you have a Radeon HD 4870 with 1 GB of graphics memory, the difference in going to the X2 will be smaller. The values shown in the table are limited by the 512 MB test card.
|Crysis Very High in fps||12800xAA||16800xAA||19200xAA||12804xAA||16804xAA||19204xAA||Overall|
|HD 4870 X2 8.10 QX@3.67||29.4||26.3||25.7||27.4||24.4||23.8||157.0|
|HD 4870 8.10 QX@3.67||31.7||25.8||21.8||21.8||15.6||12.1||128.8|
|Performance difference in percent||-7.3||1.9||17.9||25.7||56.4||96.7||21.9|
The id engine employing OpenGL responds well to CPU power. The graphics card has less of an impact, so a single chip is enough for this game.
|ET: Quake Wars in fps||12800xAA||16800xAA||19200xAA||12804xAA||16804xAA||19204xAA||Overall|
|HD 4870 X2 8.10 QX@3.67||90.1||87.6||89.1||86.4||86.3||86.1||525.6|
|HD 4870 8.10 QX@3.67||90.1||87.2||88.7||87.4||86.3||83.8||523.5|
|Performance difference in percent||0.0||0.5||0.5||-1.1||0.0||2.7||0.4|
The Source engine used to drive Half Life 2 responds more to CPU performance, getting hardly any advantage from the dual-chip Radeon HD 4870 X2.
|Half Life 2 Episode 2 in fps||12800xAA||16800xAA||19200xAA||12804xAA||16804xAA||19204xAA||Overall|
|HD 4870 X2 8.10 QX@3.67||130.3||123.5||119.9||128.6||123.4||122.4||748.1|
|HD 4870 8.10 QX@3.67||132.7||126.4||124.0||132.7||125.3||115.3||756.4|
|Performance difference in percent||-1.8||-2.3||-3.3||-3.1||-1.5||6.2||-1.1|
Mass Effect, with the UT3 engine, scales very nicely with the graphics processors (GPUs) used. The gain can be up to 80%. The game runs smoothly only with the dual-chip card, especially with anti-aliasing.
|Mass Effect in fps||12800xAA||16800xAA||19200xAA||12804xAA||16804xAA||19204xAA||12808xAA||16808xAA||19208xAA||Overall|
|HD 4870 X2 8.10 QX@3.67||131.2||129.7||125.0||116.2||87.6||70.6||114.1||85.7||69.0||929.1|
|HD 4870 8.10 QX@3.67||133.3||105.4||84.2||64.9||49.1||39.2||63.4||48.0||38.4||625.9|
|Performance difference in percent||-1.6||23.1||48.5||79.0||78.4||80.1||80.0||78.5||79.7||48.4|
Flight Simulator is unable to take advantage of two-card configurations and consequently doesn’t demonstrate any gain at all.
|MS FlightX SP2 in fps||12800xAA||16800xAA||19200xAA||12804xAA||16804xAA||19204xAA||Overall|
|HD 4870 X2 8.10 QX@3.67||29.1||29.7||29.4||29.8||29.8||29.3||177.1|
|HD 4870 8.10 QX@3.67||30.9||30.7||30.7||31.4||30.8||31.3||185.8|
|Performance difference in percent||-5.8||-3.3||-4.2||-5.1||-3.2||-6.4||-4.7|
World in Conflict without anti-aliasing responds more to CPU speed. With anti-aliasing turned on, the Radeon HD 4870 X2 gains performance, but only pays off at resolutions above 1680x1050 or 1920x1200. Below that, it’s subjectively a waste.
|World in Conflict in fps||12800xAA||16800xAA||19200xAA||12804xAA||16804xAA||19204xAA||Overall|
|HD 4870 X2 8.10 QX@3.67||53.5||56.1||54.5||50.0||52.9||52.5||319.5|
|HD 4870 8.10 QX@3.67||55.5||58.0||55.1||47.6||40.4||34.5||291.1|
|Performance difference in percent||-3.6||-3.3||-1.1||5.0||30.9||52.2||9.8|