R520的疑惑

qinkaihui

R520的疑惑
cho: 32 pipes/24

DaveBaumann
Seriously - how can anyone expect pipeline counts to double as well as adding SM3.0 support whilst extending the ALU's and register space to support full speed, single precision FP32?





confused..............

Originally posted by samsung at 2005-6-3 20:30
cho: 32 pipes/24

DaveBaumann
Seriously - how can anyone expect pipeline counts to double as well as adding SM3.0 support whilst extending the ALU's and register space to support full speed, si ...

only FP32 ?

With god's help......

Let's wait and see if R520 really has all of the features mentioned above.

Originally posted by HeavenPR at 2005-6-3 20:32
With god's help......

Let's wait and see if R520 really has all of the features mentioned above.

小姐也不肯相信第三方的说法

Originally posted by phk at 2005-6-3 20:32


only FP32 ?

no  comment

希望R520不会是哈雷慧星版。

Originally posted by eye2eye at 2005-6-3 20:52
希望R520不会是哈雷慧星版。

110nm的算不算？

某A饭坚信R520能到750MHZ

Originally posted by samsung at 2005-6-3 20:30
cho: 32 pipes/24

DaveBaumann
Seriously - how can anyone expect pipeline counts to double as well as adding SM3.0 support whilst extending the ALU's and register space to support full speed, si ...

well....
首先一個問題，Dave Orton自己也曾經說過，FP24->FP32幾乎就是非得增加那個transistor count，
所以他就說，"他們還不知道NVIDIA怎麼搞的"。(這邊指的應該是130nm)

http://www.beyond3d.com/interviews/daveorton/index.php?p=3

Now, NVIDIA has put something in 130nm that’s die size is 10-15% bigger and there’s still some understanding we have to get on their architecture.

雖然我覺得這應該怪到TSMC's 130nm process 就是了....

總之，R420光是16pipe已經用了160M，就算管線只佔70%，也是馬上變成272M；
本來看起來好像不大，但是如果再加上FP24->FP32的差距，幾乎馬上就是上到將近350M....
(然後cho認為pixel pipeline絕對超過70%)

然後，如果微縮度有很順利地線性縮小的話。
那麼就會是R423的289mm2 x 2(暫時算成320M) x (90/130)^2 = 277mm2，甚至比R423還小。

不過，另外一邊有個數字，是R423 -> R430(130 -> 110)的微縮度。
R423是289mm2，R430是240mm2，比例其實不等於130->110的微縮可達的比例。
如果把這個比例拿去用在130nm -> 90nm的話....
做一下線性轉換，大概可能會得到1/1.7左右的微縮能力，而不是1/2。
也就是說，如果以320M算的話，die-size大概會是340mm2左右，更大的機會不小；
而G70大概是330mm2左右。

NV40 可以算 R300 重生了

ATI 的人竟然说 "我们也不知道他们是怎么做到的"