![ati radeon 4800 hd ati radeon 4800 hd](https://m.media-amazon.com/images/I/71vz37Jl1zL._AC_SX450_.jpg)
![ati radeon 4800 hd ati radeon 4800 hd](https://www.guru3d.com/miraserver/images/2008/4800cf/DSC04526.jpg)
What the extra 512MB memory will do is give us a little more headroom in heavy texturized high quality environments and in the higher anti-aliasing modes preventing the frame from swapping forwards and backwards into the frame buffer. The clocks remain the same for the core/shader domain and memory frequencies. Now other than the 1024 MB GDDR5 memory packed on the card we are testing today, there is no difference otherwise. But still, with an entry product at 199 USD for the 4850 and 299 USD for the 4870 that's just an awful lot of computing power. Depending on how that is measured of course. Again there's nothing scientific or objective about that explanation.Įffectively combined with the clock speed and memory this product can poop out 1000/1200 GigaFLOPs of performance.
Ati radeon 4800 hd series#
You could (in an abstract way) say that the 4800 series have 160 Shader units, if that helps you compare it towards NVIDIA's scaling. It's a bit lame and inaccurate to do but divide the number of ATI's scalar shader processors with the number 5 and you'll roughly equal the performance to NVIDIA's stream processor. Since the GPU has 800 shader processors it can produce the raw power of 1000 to 1200 GFlops in simple precision. When you do some quick math, that's 2.5x the number of shader processors over the last-gen product, and 2.5x the number of texture units. In the last generation product we noticed 16 units, the 4800 series has 40 units. Next to the hefty shader processor increase you probably already notice the massive amount of texture units. Much like we recently noticed in the NVIDIA GTX 200 architecture, the 80 scalar stream processors per SIMD unit have 16KB of local data cache/buffer that is shared among the shader processors. If I remember correctly, one SIMD unit can handle double precision. The stream/compute/shader processors (can we please just name them all shader processors?) definitely had a good number of changes if you are into this geek talk, you'll spot 10 SIMD clusters each carrying 80 32-bit Shader processors (this accumulates to 800). The Radeon 4850/4870 series graphics processors have 800 scalar processors (320 on the HD 3800 series) and now have a significant forty texture units (was 16 in last-gen architecture). But first let's look at some nice examples of Die sizes of current architectures. The number of transistors for a midrange product like this is extreme and typically it's best to directly relate that to the number of shader processors to get a better understanding. Which for AMD still is quite large, for a 55nm product. The chip literally is 16 mm wide and high. AMD put nearly a billion transistors into that GPU, which is now built upon a 55nm (260 mm2 Die size) production. As you guys know by now ATI's Radeon HD 4850/4870 are both using the same GPU (graphics processor). First a little 101 on what the RV770 actually is all about.