Nvidia GT300 core: Speculation

Well, except that any sort of error-correcting method is likely to cause at least some performance impact. So it seems more likely they'd get more performance (for the same cost) by going with somewhat lower, more reliable speeds and not having the added overhead of error correction.

 

While there are a small number of hamming codes that correspond mathematically with some CRC codes, I'm not sure that such a code was used.

 

only impact any EDC scheme has is any overhead it requires on the interface such as either extra transmissions or pins that could of been used to increase bandwidth.

 

Well, if we're talking about pushing things to the absolute limits of signal integrity, then those should be rather significant, unless the error detection scheme really has a minuscule overhead.

 

I'm sure HEC is what they used ... see "A fast GDDR5 read CRC calculation circuit with read DBI operation". That said, they probably don't even use the error correction potential at the moment ... easier to just resend the data.

 

http://www.digitimes.com/news/a20090901PD204.html

Nvidia is scheduled to complete engineering samples of its DirectX 11-based GT300 GPU at the end of September in order to start shipping in December at the earliest, the sources noted.

 

That's more like it, finally someone with sense!

 

Hopefully they talk about CUDA 3.0 and any new capabilities that brings with it. That will tell us a lot more about the architecture than any lamo demos.

 

More GT300 speculation, less FUD please

 

I wonder when someone will start suggesting, GT300 will not be a unified shader architecture any more and that DX11 is only bolted on in the cheapest possible way.


WRT & BTW: Does Nvidia own Transmetas codemorphing patents and stuff?

 

Nah. Clearly this will be nVidia's first TBDR!

 

Nvidia roadmaps turn up

http://www.semiaccurate.com/2009/09/01/nvidia-roadmaps-turn/

Easier to post the pic than try to sum it up in words:

There's a second picture which fleshes things out. Except it looks horribly confused, naming GTX280 (not GTX285) and assigning it 1792MB of memory.

Jawed

 

Has NVIDIA commented on when they expect to have mainstream DX11 parts?

 

Because it originally said 260/275 (hence the wrong memory configuration)

 

My bet would be late 2010.

 

It may seem counterintuitive, but for any given communications channel (bandwidth and signal-to-noise ratio), the only way to approach the theoretical information carrying limit (the Shannon limit) for that channel is to employ sophisticated forward error correction. The only reason not to do so is for reasons of hardware simplicity (and cost). QPI, HyperTransport, PCIe (IIRC) all use some form of error detection and/or correction to obtain the highest speeds.

 

'originally'?

 

Are serious questions allowed to an obvious joke? And what the hell does it need that much bandwidth for then huh?

 

Well, it worked out in the with "Evergreen/Hemlock"

 

It's funny that Charlie was so busy hailing Nvidia's downfall that the "journalist" in him neither noticed nor questioned those obvious inconsistencies