GeForce GTX 400 Series specification preview.

就過去的經驗來說,離產品上市愈近,其流出的消息也都愈準確,而那些簽了NDA的人也都對這些消息是恨的牙癢癢的。
我們先來看看以下網站提供的訊息:
Easing the tension of waiting for leaked GeForce GTX 400 scores, a fresh batch of GTX 480 pictures have hit the webz, showing in detail the card’s final design. Seen below by its own and close to a Radeon HD 5970, Nvidia’s dual-slot GF100-powered beast boasts a quad-heatpipe, single fan cooling system, 480 CUDA Cores, a 384-bit memory interface and 1536MB of GDDR5 VRAM @ 3696 MHz, a GPU clock of 700 MHz, a shader frequency of 1401 MHz, two PCIe power connectors, and dual-DVI, plus HDMI outputs.







GeForce GTX 480 : 480 SP, 700/1401/1848MHz core/shader/mem, 384-bit, 1536MB, 250W TDP, US$499
GeForce GTX 470 : 448 SP, 607/1215/1674MHz core/shader/mem, 320-bit, 1280MB, 225W TDP, US$349
* The intended GF100 has 512 SP clocked at 725/1450/1050MHz with 295W TDP. It should still be released in the future but just not now. For this launch, GTX 480 has 480 SP with clocks lowered to 700/1401/1848MHz at 250W TDP.

好,接下來我們來玩推理遊戲吧!因為不明的原因,屆時推出的GeForce GTX 480、470,其Stream Processors(SP)數量都有些變化。原本以為GeForce GTX 480會有512個SP,但是卻只有480個,也就是原本的16組的SM,只剩下了15組,而SM少了一組,Texture Unit也少了4個,所以4個Texture Unit x 15組=GeForce GTX 480有60個。
而ROP與L2 Cache是在一起的單元,所以刪SM時不會跟ROP一起刪,所以GeForce GTX 480應該還是會保持48個ROP,但GeForce GTX 470為保持效能差距,可能會被降成了44或40個ROP。所以,我們來總結一下:
GeForce GTX 480
  • 15組SM
  • 480個SP
  • 60個Texture Unit
  • 48個ROP
  • SP:700MHz
  • Shader:1401MHz
  • Memory:1848MHz(GDDR5 3696MHz)
  • Memory Bandwidth:384-bit
  • Memory:1536MB
  • Price:US$499

GeForce GTX 470
  • 14組SM
  • 448個SP
  • 56個Texture Unit
  • 44 or 40個ROP
  • SP:607MHz
  • Shader:1215MHz
  • Memory:1674MHz(GDDR5 3348MHz)
  • Memory Bandwidth:320-bit
  • Memory:1280MB
  • Price:US$349

以上,只是小弟個人的推論,是否正確,還得要看看3月26日NDA解禁當天了。