|ASUS EAH4870 DK TOP 512MB Video Card|
|Reviews - Featured Reviews: Video Cards|
|Written by Matt Williams|
|Sunday, 21 December 2008|
Page 5 of 15
EAH4870 DK TOP Detailed Features
In addition to its Dark Knight classification, the EAH4870 DK Top is also distinguished by its "Top" designation. In ASUS lingo, this simply translates into factory overclocking. Stock 4870 GPUs run at 750MHz and a memory speed of 900MHz (3600MHz effective). This model, on the other hand, features a GPU clock speed of 815MHz and a memory speed of 925MHZ (3700MHZ). This results in what ASUS claims to be a 9% performance lead over generic 4870s. We'll be testing this claim a bit later in the review, but before we get there I'd like to touch on a few more features.
The Radeon HD 4870 is built on AMD's award-winning RV770 architecture. The heart of the RV770 is its 800 stream processors, separated into 10 SIMD cores communicating in parallel. Additional features of the RV770 include 40 texture mapping units, 16 ROPs, and a 256-bit memory bus. All of this adds up to a theoretical computing performance of up to 1.2 TeraFLOPS (single precision). Of course, there is more to a video card than raw performance, which is why the EAH4870 DK Top also includes AMD's Unified Video Decoder 2 and full 7.1 HD audio via HDMI.
For memory, ASUS went with 512MB of GDDR5. These particular chips come from Qimonda, model IDGV51-05A1F1C-40, and are rated up to 1000MHz (4GHz effective). As you'll see in the overclocking section, however, they can be pushed well beyond that spec.
All of this computing power does come at a price: increased power consumption. You'll need a power supply rated at at least 500 Watts and two 6-pin PCIe connections (one 4-pin to 6-pin adapter is included). If you're already sitting on a quality power supply, then is essentially a non-issue--save the increased utility bill. If not, this is something you'll definitely want to take into consideration when deciding on your video card.