NVIDIA GF100 & Friends speculation

Not really, because this is the GTX 470. The GTX480 would be a 448 part with higher clocks and 48 ROPs. So the difference between the 448 and the 512 chip is only 14,2%.

 

Why would the 448SP part be the GTX480 and the 512SP part be the GTX470? That makes absolutely no sence what so ever.

And initial rumors had the 448 part at around 400 core and the 512 part around 600.

 

I throught there will be no 512 part as real product. So why should they use all chips only for the GTX470 cards with less than 48 rops and lower clocks? You said they must disable two SM but that has nothing to do with the ROPs and the clocks...

 

No, I said they were getting mostly 448 parts of the line and that 512 part were nearly non existent and that they were planning a B1/respin to try and fix that. THEY want to have 512SP part out for sale.

 

The point being Nvidia doesn't have much room to do a refresh for a big. They are already die size limited and there won't be another process ready. Refreshes tend to consist of things like shrinks or increased die sizes or moderate to significant frequency bumps. Which is also out because they are very power limited.

What I'm saying is they don't have a lot of wiggle room on the engineering side to do a refresh at least until the next process step.

 

You said that 99% of the chips will be 448 parts. So why should they use all of these chips for a lower clocked 448 card with 40 ROPs, when they can use a lot of them for 448 part with clocks like the 512 version, 48 rops and 1,5gb?

 

Man qouting myself can be a pain, but here it goes.

http://forum.beyond3d.com/showpost.php?p=1392678&postcount=3835

That is my post and here is what I said. I think you misread or understood what I said.

"The reason for the respin/B1 is because 99% of what they have been getting off the line has been 448SP parts"

Does not say 99% of teh chips will be 448 parts. It states simply that 99% of what has been coming from TSMC has been 448 parts.

 

You wrote this:

So the first thing is that nVidia must disable two sm to use 99% of the chips and they will use them only for the GTX470 part.
My question was why would they do that? They can use many of them for a GTX475 with higher clocks and more rops than the GTX460 card.

 

Dont know. All I can say is what I have heard. And what I've heard is 448 part are a plenty and the 512s are scarce and they are not the least bit happy over it.

 

And if the double-precision limiting is a driver hack in search of a hardware reflection? I don't know if they could save trannies by removing Tesla-specific features, and I'm not sure it would be wise if they did, but would that not give them some room?

FWIW, I would be surprised to see a refresh prior to the money-makers shipping.... Shipping their high-end is only the start of this release cycle, no?

 

Good to see we're helping to ask those tough GF100 questions

http://www.brightsideofnews.com/new...-has-29-tough-gf100-questions-for-nvidia.aspx

 

Production silicon has been at NV for a few weeks. It is in very bad shape, awful in fact.

-Charlie

 

They are not happy with the number of 448SP parts either, but that is not going to stop them from a triumphant launch.

-Charlie

 

Somewhat poorly worded IMO.

 

It is even worse when your architecture is broken on top of crap yields.

-Charlie

 

Where's my AMD CPU and ATI video card?!? All reputation, no gain.

 

Smelling a top of the line GTX580 by august. Man that thing is gonna ROCk!

 

But assuming somewhat normal error distribution, if 99% of the working parts only qualify as 448 shader parts, I would expect that something around 90% doesn't work at all...
Unless there's some very specific problem only affecting some simds (e.g. like bogus clock routing or whatnot).

 

Hmmm well let's hope he's even more wrong this time too, eh?

 

Dont know where you are getting that from, but your wrong. Sure the yields aren't what they'd like, but they are happy with the chip overall. They are pisses that 512SP parts aren't coming like they like/want but, but they hope to have a fix for that by mid summer with 512 and 448 parts, improved yields and less issues aswell.