Cayman XT photo leak

[mrblotto]

I just came in here to say I thought the title said 'Caveman XT photo leak' and was thinking to myself 'well, that's not a very good name for a video card!'

Carry on

 

[dug777]

Can't be right, on the mem bandwidth figures alone I think...

IIRC a 6600GT was ~16GB/s with 128bit/1ghz DDR3.

This is 128 bit/800mhz from that, and 25GB/s.

EDIT: 14GB/s was the AGP version, fixed for the 1Ghz figure.

Any further thoughts on mine above re that gpu-z shot of the 6300?

 

[Skurge]

It could be using GDDR5.

Thats the only thing that explains it.

 

[dug777]

It could be using GDDR5.

Thats the only thing that explains it.

Agreed, if GPU-z is reporting correctly for that checkbox

 

[ExcaliburMM]

Oh how I love the rumor mill and early reports. Even the low end card looked good for a half height, fanless card.

If 6000 turns out to be as nice as the rumor mill is currently making it sound, I may finally get to retire this damn 4870 1GB. I love it but even with the Zalman cooler I put on it it still runs too hot for my tastes. A 6770 or 6850 might be just what the doctor ordered.

 

[evolucion8]

Oh how I love the rumor mill and early reports. Even the low end card looked good for a half height, fanless card.

If 6000 turns out to be as nice as the rumor mill is currently making it sound, I may finally get to retire this damn 4870 1GB. I love it but even with the Zalman cooler I put on it it still runs too hot for my tastes. A 6770 or 6850 might be just what the doctor ordered.

Imagine my situation, I have two of those in CF!! You can feel the heat in my feet under the desk! They're 160W cards, I hope the HD 6870 doesn't reach the 220W.

 

[Skurge]

Agreed, if GPU-z is reporting correctly for that checkbox

Has W1zzard said anything about that GPU-Z shot?

 

[Daedalus685]

Any further thoughts on mine above re that gpu-z shot of the 6300?

Not sure what you mean...

800Mhz * 2 (for DDR3) * 128bit / 8bit/B = 25.6GB/s

Exactly what GPUz is reporting. If it were DDR5 the value woudl be 50.2GB/s

 

[SlowSpyder]

Not sure what you mean...

800Mhz * 2 (for DDR3) * 128bit / 8bit/B = 25.6GB/s

Exactly what GPUz is reporting. If it were DDR5 the value woudl be 50.2GB/s

Haha... I did the math earlier but forgot about the x2 for being DDR. I was confused too. I wondered why I kept getting 12.x GB/s.

 

[CrystalKing]

PCB pics

Cayman XT Sample Cards, PCB likes HD5870, core 900mhz, but I don't know if it is the final frequency, 6+8pin

From Chiphell/nApoleon^_^

 

[Skurge]

I was hoping they would keep the black backplate

 

[Grooveriding]

I was hoping they would keep the black backplate

They very well might, I believe if memory serves, some of the leaked 5870 pics lacked backplates.

 

[evolucion8]

That card seems heavy, a nice backplate should do the work.

 

[HurleyBird]

Huh, looks like 256-bit again after all.

 

[RussianSensation]

Huh, looks like 256-bit again after all.

It's likely cheaper to manufacture a 256-bit PCB with faster GDDR5 memory chips than go 320/384-bit. Given the direction of current game design, ambient occlusion, tessellation, shadow mapping, geometry/particle performance, etc. are far more critical than 250+ GB/sec memory bandwidth.

 

[HurleyBird]

It's also a new architecture which may be less sensitive to bandwidth. It's also possible that the die size hasn't really increased and there isn't enough room. In any case, the good news is that we should be looking at a 2GB frame buffer instead of a 1.5GB one. Or to put it another way, another ~2 years before we start coming up on the limits of 2GB as opposed to ~1 year for 1.5GB (and yes, we are already just beginning to come onto the limits of 1GB)

 

[Daedalus685]

It's also a new architecture which may be less sensitive to bandwidth. It's also possible that the die size hasn't really increased and there isn't enough room. In any case, the good news is that we should be looking at a 2GB frame buffer instead of a 1.5GB one

Do the current 2GB cards have to use a clamshell design or can the entirety fit on the 8 GDDR5 chips?

Wondering if the lack of memory on the back side excludes the possibility that it is 2Gb or not. How large are the new high speed GDDR5 chips?


EDIT:

I just found a pic of the 5870 toxic 2Gb without the back plate on (finally):

http://www.overclockersclub.com/reviews/sapphire__hd5870_toxic_2gb/2.htm

The 2GB are clamshell and on the front AND back. Thus, unless the 6000 series has double the density (I don't know how things have changed with the new faster chips) the card pictured in the posts above is a 1GB version.

 

[MrK6]

It's likely cheaper to manufacture a 256-bit PCB with faster GDDR5 memory chips than go 320/384-bit. Given the direction of current game design, ambient occlusion, tessellation, shadow mapping, geometry/particle performance, etc. are far more critical than 250+ GB/sec memory bandwidth.

Exactly. AMD has been doing this since the 48xx series and my guess is it has been working well for them. If the leaked GPU-Z shots are correct, GDDR5 @ 1600MHz should give 204GB/s bandwidth, which should be more than sufficient. I'm not sure how the 256-bit bus mates up with the larger core, but I'd imagine it all flows well.

Do the current 2GB cards have to use a clamshell design or can the entirety fit on the 8 GDDR5 chips?

Wondering if the lack of memory on the back side excludes the possibility that it is 2Gb or not. How large are the new high speed GDDR5 chips?


EDIT:

I just found a pic of the 5870 toxic 2Gb without the back plate on (finally):

http://www.overclockersclub.com/reviews/sapphire__hd5870_toxic_2gb/2.htm

The 2GB are clamshell and on the front AND back. Thus, unless the 6000 series has double the density (I don't know how things have changed with the new faster chips) the card pictured in the posts above is a 1GB version.

Supposedly, the new 7Gbps GDDR5 comes in double the density, so they might not need to put the chips on the back. I'd love to see 2GB be the reference design.

 

[Grooveriding]

Exactly. AMD has been doing this since the 48xx series and my guess is it has been working well for them. If the leaked GPU-Z shots are correct, GDDR5 @ 1600MHz should give 204GB/s bandwidth, which should be more than sufficient. I'm not sure how the 256-bit bus mates up with the larger core, but I'd imagine it all flows well.
Supposedly, the new 7Gbps GDDR5 comes in double the density, so they might not need to put the chips on the back. I'd love to see 2GB be the reference design.

If the card is 256 bit, I hope there is a reference 2GB card then that is not hard to come by in the market.

 

[dug777]

Not sure what you mean...

800Mhz * 2 (for DDR3) * 128bit / 8bit/B = 25.6GB/s

Exactly what GPUz is reporting. If it were DDR5 the value woudl be 50.2GB/s

I am confused now, then how was the 6600GT with 1ghz DDR3 only 16GB/s on a 128-bit bus?

EDIT: I am sure I am missing something painfully obvious!

 

[Daedalus685]

I am confused now, then how was the 6600GT with 1ghz DDR3 only 16GB/s on a 128-bit bus?

EDIT: I am sure I am missing something painfully obvious!

The memory frequency of the 6600 GT was only 500Mhz. The 1000 you are quoting is already double pumped for GDDR3. 500Mhz*2*128bit / 8bit/B = 16GB/s


The AMD HD6000 series card has MUCH faster GDDR3 memory, GPUz quotes the base clock, not the effective. 800Mhz vs 500Mhz (which makes sense given how long it has been since the 6600GT).

 

[dug777]

The memory frequency of the 6600 GT was only 500Mhz. The 1000 you are quoting is already double pumped for GDDR3. 500Mhz*2*128bit / 8bit/B = 16GB/s


The AMD HD6000 series card has MUCH faster GDDR3 memory, GPUz quotes the base clock, not the effective. 800Mhz vs 500Mhz (which makes sense given how long it has been since the 6600GT).

Awesome, thank-you! That was all I could think of, but it's so long since my 6600GT I couldn't remember how GPU-z reported it

 

[Grooveriding]

How large are the new high speed GDDR5 chips?

http://news.softpedia.com/news/Hynix-Intros-7Gbps-GDDR5-Memory-98481.shtml

http://www.elpida.com/en/news/2010/06-24.html

 

[Daedalus685]

http://news.softpedia.com/news/Hynix-Intros-7Gbps-GDDR5-Memory-98481.shtml

http://www.elpida.com/en/news/2010/06-24.html

Hmm..

So one company manufactures the same density (8 chips per GB) and the other is releasing double that.

Given the timeline on the 2Gb chips I'd have to assume these leaks are 1GB cards though.

 

[mindfury]

http://www.chiphell.com/forum.php?m...=fastpost&random=0.38606609877944853#lastpost

Barts: