NVIDIA GT200 Rumours & Speculation Thread

damn is that a 8 pin pci-e i was hoping that because its pci-e 2.0 it wouldn't be....
soo damn small cant anyone take pictures in higher resolutions...

 

Yes, that's 6pin+8pin

 

http://forum.beyond3d.com/showpost.php?p=1164215&postcount=1205

 

Every chip has an array of contact pads, similar to pins on a CPU. This includes pins that connect the GPU to the memory chips. The bigger the width, the more the pins. Because of that, there's a lower limit of die surface for each bus, e.g. for 256bit it's around 190 mm2. GT200 is enough large to accomodate a 512bit bus, its die-shrink might not be. Therefore, to keep memory bandwidth in the same numbers, they would need faster memory = GDDR5.

Oh yes it does. G71, G73, R580 were all limited by GDDR3 of their time. G92 is limited by GDDR3 today. I imagine nVidia calculated the optimal memory throughput for GT200 and will easily reach the number even using cheaper GDDR3. But imagine they'd shrink the chip, lowering the TDP and making GX2 card possible. But a 512bit bus would no longer fit, so they'd have to narrow it down to 256 bits. Now if they used GDDR3, the chips would only get about half their calculated optimal bandwidth and that sure would limit them.

Of course, but why would nVidia purposedly screw up a product?

 

yeah but even with gddr5 a 256 bit bus would cripple that card especially if it has 2 gigs of memory - couldn't they squeeze a 384 or a 448 bit bus on that?

 

Why would they cripple it if the resulting throughput would stay the same?

 

i don't understand your assuming gddr5 would make up the difference in loss of bandwidth with a smaller bus wheres the evidence?

 

but would the increase in speed make up for that? thats all im asking
and also i read the message after i made that post sorry
im new at forums soo i make alot of mistakes

 

512 bits × 2 GHz (eff.) = 128 GB/s
256 bits × 4 GHz = 128 GB/s
The second setup would probably be a little bit slower if they used 4 channels with 64 bits per chn. (GT200 has 8 channels), plus probably higher latencies of GDDR5, but nothing an extra few MHz couldn't fix.

 

oh i didn't realize the math was that simple thanks theres soo much i don't know (don't get me wrong i know my fair share) i knew that gddr5 was much faster i knew the numbers im not defending gddr3 id welcome gddr5 im just thinking i guess

 

That always happens in ever generation of cards no matter what even with a gx2.

well if this card is using 240 watts .......

 

A 512 bit bus maybe could not fit, but maybe a 384 bit bus could.
And a 2x384 bit bus should be not so bad, I guess

 

Whats this last Single GPU crap?

 

I hate SLI.
i hope someone can tell me it won't work as SLI GPU and it will act like one single GPU.

 

I'm afraid ifs and buts dont go well in discussions.

The last monolithic gpu bit sounds iffy, but that could also (possibly) hint at the (huge) die-size?

 

Well I guess they are guessing die size is getting to big for a single GPU, but come on they can always go down in microns.

Well take the if out of that statement if you don't like it serenity

 

They are finally gonna use Rampage and Sage tech!

 

Can you imagine how complex would the PCB need to be to accomodate for two GPUs with 12 memory chips each? That would make one hell of an expensive board.