NVIDIA GF100 & Friends speculation

[Kaotik]

Gigabyte Geforce GTX 480 box has typo, "Gigabyte Ati Radeon 5000 series supports DirectX 11". hehe

Not to mention it has ATI Tesselation demo pics next to it, too

GTX470:

Vantage P16600
crysis,1920X1200 veryhigh+8x aa,24fps
crysis,1920X1200 veryhigh+No aa,53fps


Rumor from Chinese forum~
http://mylab.q.yesky.com/thread-121-1-1.html

They're using GDDR5 @ 800MHz?

 

[Mindfury]

You'll have to be more specific The stuff that used to run on the core clock now runs in different domains. When we say core clock today are we referring to the ROPs or scheduler/texture units?

GF100's core clock is GPC clock.

 

[trinibwoy]

Ok, yes in that case 625/1296 doesn't make sense.

 

[eastmen]

Not to mention it has ATI Tesselation demo pics next to it, too



They're using GDDR5 @ 800MHz?

Ibelieve the slowest gddr 5 speed is 900mhz

 

[Mindfury]

Ibelieve the slowest gddr 5 speed is 900mhz

4770 use 800Mhz GDDR5

Maybe dual 6-pin limit GTX470 memclock.

 

[Dave Baumann]

HD 4870 is running at 900Mhz. Could have been 1000Mhz but I traded some memory speed for engine clock (whilst staying at the same power) once we found the A12 speeds were higher.

Min speeds for GDDR5 device binning is really 1000Mhz.

 

[digitalwanderer]

Gigabyte Geforce GTX 480 box has typo, "Gigabyte Ati Radeon 5000 series supports DirectX 11". hehe

Oh man that's funny, has Gigabyte caught the error yet?

 

[eastmen]

HD 4870 is running at 900Mhz. Could have been 1000Mhz but I traded some memory speed for engine clock (whilst staying at the same power) once we found the A12 speeds were higher.

Min speeds for GDDR5 device binning is really 1000Mhz.

thanks for correcting me on the memory speeds dave. :smile:

 

[trinibwoy]

Min speeds for GDDR5 device binning is really 1000Mhz.

Why does Hynix offer 800/900Mhz GDDR5 then?

"It supports not only 5Gbps @ 1.5v but 3.2Gbps @ 1.35v"

http://www.hynix.com/datasheet/eng/...1=01&menu2=04&menu3=05&menuNo=1&m=3&s=5&RK=26

 

[Ninjaprime]

Why does Hynix offer 800/900Mhz GDDR5 then?

"It supports not only 5Gbps @ 1.5v but 3.2Gbps @ 1.35v"

http://www.hynix.com/datasheet/eng/...1=01&menu2=04&menu3=05&menuNo=1&m=3&s=5&RK=26

Maybe thats how they got it to only need 2x6 pin by using low power 1.35v memory.

 

[eastmen]

Why does Hynix offer 800/900Mhz GDDR5 then?

"It supports not only 5Gbps @ 1.5v but 3.2Gbps @ 1.35v"

http://www.hynix.com/datasheet/eng/...1=01&menu2=04&menu3=05&menuNo=1&m=3&s=5&RK=26

I see the ordering information.


It lists VDD/VDDQ = 1.5v parts s1ghz CK frequency with WCK frequency 2GHZ and 4gbps as the lowest.

So thats 1ghz gddr5 like dave said .

So it sounds like you migt be buying 1.25ghz ram and under voling it to 800mhz otherwise that slower ram is a part not offered anymore

 

[Dave Baumann]

Why does Hynix offer 800/900Mhz GDDR5 then?

"It supports not only 5Gbps @ 1.5v but 3.2Gbps @ 1.35v"

http://www.hynix.com/datasheet/eng/...1=01&menu2=04&menu3=05&menuNo=1&m=3&s=5&RK=26

Anything can be binned to support lower speeds at lower voltages. Note that it is a higher rated device binned there.

 

[DavidGraham]

They're using GDDR5 @ 800MHz?

No , If you notice , it says something about 2555MB , which is probably the memory bandwidth , .. if that is true , then the base clock should be 1600MHz as he said , the effective clock for GDDR would be 3200MHz , and then the real clock for GDDR5 would be 6400MHz .

That would effectively translate to 2555MB :
(6400 X 320) /8 = 256GB !

OR , it could be the amount double the original memory : 1280X2 = 2560MB .

 

[trinibwoy]

Anything can be binned to support lower speeds at lower voltages. Note that it is a higher rated device binned there.

Yep, that was precisely why I was questioning your earlier comment about 1Ghz being the lowest bin. Dropping down to 1.35v from 1.5v may result in considerable power savings (and they might be cheaper to boot).

 

[Mindfury]

No , If you notice , it says something about 2555MB , which is probably the memory bandwidth , .. if that is true , then the base clock should be 1600MHz as he said , the effective clock for GDDR would be 3200MHz , and then the real clock for GDDR5 would be 6400MHz .

That would effectively translate to 2555MB :
(6400 X 320) /8 = 256GB !

OR , it could be the amount double the original memory : 1280X2 = 2560MB .

2555MB is total available graphic memory(card mem+system shared mem),not bandwidth.

 

[Kaotik]

No , If you notice , it says something about 2555MB , which is probably the memory bandwidth , .. if that is true , then the base clock should be 1600MHz as he said , the effective clock for GDDR would be 3200MHz , and then the real clock for GDDR5 would be 6400MHz .

That would effectively translate to 2555MB :
(6400 X 320) /8 = 256GB !

OR , it could be the amount double the original memory : 1280X2 = 2560MB .

There's no way in hell it has 1600MHz (6400MHz effective) memories, you would end up paying both hand and a leg just to get a chance to get to GTX470 queue if it had

The 2555MB is probably the "total memory", I mean, approx. total memory for my HD3870 512MB for example is 2297MB according to DXDiag, so it's just likely reporting what DXDiag would report, as the cards CAN use your system RAM too. The 1280MB shows the actual memory amount.

 

[Dave Baumann]

Yep, that was precisely why I was questioning your earlier comment about 1Ghz being the lowest bin. Dropping down to 1.35v from 1.5v may result in considerable power savings (and they might be cheaper to boot).

Given they are from a higher speed bin, the devices themselves won't be cheaper.

 

[trinibwoy]

Oh right, they did mention the 5Gbps bin....at least the lower power consumption should help and it sounds like they need as much help in that area as possible.

 

[Ailuros]

With the top dog probably sporting =/>190GB, it doesn't surprise me if the 470 is at 128GB/s bandwidth.

If the 470 has all 4 rasters enabled it'll have half the ROPs of the 480 for added AA efficiency (16 vs. 8).

 

[Blazkowicz]

Isl there software voltage control of the memory?
that would allow some easy overclocking (and I hope it trickles down to the smaller GPU)