So then, it's time to talk business. The GeForce GTX 680 released today is based on the new Kepler GPU architecture. Interestingly enough it is based on the 28nm GK104 GPU which typically would have indicated a mid-range product. The 10" long GeForce GTX 680 boasts an impressive 1536 CUDA (shader) cores. The product is obviously PCI-Express 3.0 ready and has a TDP of around 195W with a typical draw of 170W. But let me first show you GK104:
NVIDIA GK104 Kepler architecture GPU
As far as the memory specs of the GK104 Kepler GPU are concerned, the boards will feature a 256-bit memory bus connected to 2 GB of GDDR5 video buffer memory, but later versions will also be available with 4 GB of VRAM. On the memory controller side of things you'll see very significant improvements as the reference memory clock is now set at 6 GHz / Gbps. This boils down to to a memory bandwidth of 192 GB/s on that 256-bit memory bus. It's actually similar bandwidth to the GeForce GTX 580.
An immediate difference to the GPU core versus the shader processor domain is that both will be clocked at 1:1, meaning both the core and shader domain clock in at 1006 MHz, that means that the 2x shader hotclock from the last generation products is a thing of the past. One clock to rule them all (well internally there are dozens of different other clocks really, but let's keep it simple).
With this release, NVIDIA now has the first series 600 cards on its way. The new graphics adapters are of course DirectX 11.1 ready. With Windows 8, 7 and Vista also being DX11.1 ready all we need are some games to take advantage of DirectCompute, multi-threading, hardware tessellation and the latest shader 5.0 extensions.
For your reference here's a quick overview of some past generation high-end GeForce cards opposed to the new Kepler based GeForce GTX 680.
GeForce GTX 285
GeForce GTX 480
GeForce GTX 580
GeForce GTX 680
Stream (Shader) Processors
Core Clock (MHz)
Shader Clock (MHz)
Memory Clock (effective MHz)
Two Dual link DVI
For Kepler, NVIDIA kept their memory controllers GDDR5 compatible. Memory wise NVIDIA has nice large memory volumes due to their architecture, we pass 2 GB as standard these days for most of NVIDIA's series 690 graphics cards.
The hardware engineers of NVIDIA reworked the memory subs system quite a bit, enabling much higher memory clock frequency speeds compared to previous generation GeForce GPUs. The result is this memory speeds up-to 6 Gbps. Each memory partition utilizes one memory controller on the respective GPU, which will get 256/512 MB of memory tied to it. There is word that a 4 GB version will be manufactured as well.
The GTX 580 has six memory controllers (6x256MB) = 1536 MB of GDDR5 memory
The GTX 680 has four memory controllers (4x512MB) = 2048 MB of GDDR5 memory
MSI GeForce GTX 960 Gaming OC review We review the MSI GeForce GTX Gaming OC, the card comes with a newly revised TwiNFrozr model cooler. And that makes it silent and deadly as you will not hear this product. The GTX 960 is introduced in th...
Gigabyte GeForce GTX 960 G1 Gaming review In this review we check out the Gigabyte G1 Gaming GeForce GTX 960. This product is gorgeous as it is the most silent of all the cards we tested. Next to some fantastic looks the product comes factory...
ASUS GeForce GTX 960 Strix 2-way SLI review We review the ASUS Strix edition of the GeForce GTX 960. Actually not one, but two of them as we go SLI all the way as well. This premium version of the GTX 960 comes with an all silent design, good l...
KFA2 GeForce GTX 960 EXOC review KFA2 aka GALAX releases their mid-range GeForce GTX 960 EXOC edition, yep as in Extreme Overclocked. The product comes factory overclocked with a boost clock of 1266 MHz. The product has a custom and ...