Radeon HD 7870 vs GeForce GTX 660

Speed and memory

In our performance index the Radeon HD 7870 scores 3.8 and the GeForce GTX 660 scores 3.5, which makes the Radeon HD 7870 about 9% faster. That is a small gap, below what most people notice without a frame counter.

Both cards have 2 GB of video memory, so memory will not separate them.

In our estimates for popular games at 1080p on High, the biggest gap is in Cyberpunk 2077 (7 against 6 fps), and the smallest is in Fortnite (47 against 44 fps). Games that are light enough to run above 200 fps on both cards show little difference at all.

Power and value

The Radeon HD 7870 is rated at 175 W and the GeForce GTX 660 at 140 W. With a mid-range processor that means a power supply of about 550 W for the first and 450 W for the second. The power draw is close enough that cooling and noise will be similar.

At launch the Radeon HD 7870 cost $349 and the GeForce GTX 660 $229. Per dollar, the GeForce GTX 660 gave more performance (1.5 points per $100 against 1.1). Current prices differ, so run the same sum on what you can actually buy today.

Which one to buy

Choose the Radeon HD 7870 if you want the faster card, and it also has at least as much memory. It makes the most sense at 1440p and above, or on a monitor with a high refresh rate.

Choose the GeForce GTX 660 if the price gap matters more than the 9% speed difference, or if you want lower power draw and a quieter PC. Whichever you pick, check reviews for the games you play, because two cards with similar scores can differ in individual titles.