Just for fun. Any math wizzes? 6800 to 7800. link to pic

[Keysplayr]

The caption on the pic says it all guys. This is just for laughs for have fun with it.
6800 to 7800 core size pic.

Enjoy.

 

[Mingon]

Well whats not nown is how many layers it is. Assuming it is the same its got to be 24pipe 8vs + other new stuff.

 

[Keysplayr]

I didn't actually know that cores of any kind had layers. Do they?

 

[jiffylube1024]

Way too many variables. I'm sure there's more of a difference between the two than just pipelines. Not to mention the fact that both ATI and Nvidia's next cards are supposed to have architectural changes where pipelines aren't the same as before, eg they can be used for Pixel or Vertex shaders instead of one or the other.

I'll wait until they release spec sheets myself (not to mention some actual previews), but if anyone else wants to try to guess the number of jellybeans in that jar, go right ahead .

 

[Mrvile]

Hmm doesn't really take a math wiz to figure this out though.

The 6800 core has an area of approx 500 sq mm. The 7800 core has an area of approx 625. The ratio between the two is 110:130, or 11:13. Now multiply 500 by 11:13 and you get about 423.078 sq mm. Multiply this by 2 and you get aobut 850, which is what would be required to run 32 pipes (assuming that there were no layers and whatnot). So no, the 7800 can't have 32 pipes )).

 

[Lonyo]

Originally posted by: Mrvile
Hmm doesn't really take a math wiz to figure this out though.

The 6800 core has an area of approx 500 sq mm. The 7800 core has an area of approx 625. The ratio between the two is 110:130, or 11:13. Now multiply 500 by 11:13 and you get about 423.078 sq mm. Multiply this by 2 and you get aobut 850, which is what would be required to run 32 pipes (assuming that there were no layers and whatnot). So no, the 7800 can't have 32 pipes )).

You are slightly wrong there.
You forgot that it's (11/13)^2, since it's sq mm not just mm.
Which is why a 90nm Athlon X2 core is about the same size as a 13nm Clawhammer core.

500 * 0.71 (11/13^2 approx) gives 350mm approx, or 700 for 2, which is still too much for the G70 to have double the number of pipes, I think.
BUT: The die isn't going to be made up just of pipes, so it depends on how much of the 500mm is pipes, and how much is other stuff like hardware for video playback or other tasks.

Originally posted by: jiffylube1024
Way too many variables. I'm sure there's more of a difference between the two than just pipelines. Not to mention the fact that both ATI and Nvidia's next cards are supposed to have architectural changes where pipelines aren't the same as before, eg they can be used for Pixel or Vertex shaders instead of one or the other.

I'll wait until they release spec sheets myself (not to mention some actual previews), but if anyone else wants to try to guess the number of jellybeans in that jar, go right ahead .

Err, no, they aren't on a unified architecture yet.
The R500 for XBox has one, no nVidia chips do yet (RSX or G70). The R520 doesn't either.

 

[Mrvile]

Originally posted by: Lonyo

Originally posted by: Mrvile
Hmm doesn't really take a math wiz to figure this out though.

The 6800 core has an area of approx 500 sq mm. The 7800 core has an area of approx 625. The ratio between the two is 110:130, or 11:13. Now multiply 500 by 11:13 and you get about 423.078 sq mm. Multiply this by 2 and you get aobut 850, which is what would be required to run 32 pipes (assuming that there were no layers and whatnot). So no, the 7800 can't have 32 pipes )).

You are slightly wrong there.
You forgot that it's (11/13)^2, since it's sq mm not just mm.
Which is why a 90nm Athlon X2 core is about the same size as a 13nm Clawhammer core.

500 * 0.71 (11/13^2 approx) gives 350mm approx, or 700 for 2, which is still too much for the G70 to have double the number of pipes, I think.
BUT: The die isn't going to be made up just of pipes, so it depends on how much of the 500mm is pipes, and how much is other stuff like hardware for video playback or other tasks.

Originally posted by: jiffylube1024
Way too many variables. I'm sure there's more of a difference between the two than just pipelines. Not to mention the fact that both ATI and Nvidia's next cards are supposed to have architectural changes where pipelines aren't the same as before, eg they can be used for Pixel or Vertex shaders instead of one or the other.

I'll wait until they release spec sheets myself (not to mention some actual previews), but if anyone else wants to try to guess the number of jellybeans in that jar, go right ahead .

Err, no, they aren't on a unified architecture yet.
The R500 for XBox has one, no nVidia chips do yet (RSX or G70). The R520 doesn't either.

D'oh! I stand corrected. I knew I shouldn't have attempted math in the summer!

 

[otispunkmeyer]

Originally posted by: Mrvile

Originally posted by: Lonyo

Originally posted by: Mrvile
Hmm doesn't really take a math wiz to figure this out though.

The 6800 core has an area of approx 500 sq mm. The 7800 core has an area of approx 625. The ratio between the two is 110:130, or 11:13. Now multiply 500 by 11:13 and you get about 423.078 sq mm. Multiply this by 2 and you get aobut 850, which is what would be required to run 32 pipes (assuming that there were no layers and whatnot). So no, the 7800 can't have 32 pipes )).

You are slightly wrong there.
You forgot that it's (11/13)^2, since it's sq mm not just mm.
Which is why a 90nm Athlon X2 core is about the same size as a 13nm Clawhammer core.

500 * 0.71 (11/13^2 approx) gives 350mm approx, or 700 for 2, which is still too much for the G70 to have double the number of pipes, I think.
BUT: The die isn't going to be made up just of pipes, so it depends on how much of the 500mm is pipes, and how much is other stuff like hardware for video playback or other tasks.

Originally posted by: jiffylube1024
Way too many variables. I'm sure there's more of a difference between the two than just pipelines. Not to mention the fact that both ATI and Nvidia's next cards are supposed to have architectural changes where pipelines aren't the same as before, eg they can be used for Pixel or Vertex shaders instead of one or the other.

I'll wait until they release spec sheets myself (not to mention some actual previews), but if anyone else wants to try to guess the number of jellybeans in that jar, go right ahead .

Err, no, they aren't on a unified architecture yet.
The R500 for XBox has one, no nVidia chips do yet (RSX or G70). The R520 doesn't either.

D'oh! I stand corrected. I knew I shouldn't have attempted math in the summer!

i did my mechanical engineering maths test the other week....i dont wanna see another differential equation again!

more on topic.....core sizes....layers? do they have it set up like a cake or something? ie like hardware TnL on one layer, then Pixel shaders on top of that, video processor on top of that....etc?

 

[Lonyo]

Originally posted by: otispunkmeyer

Originally posted by: Mrvile

Originally posted by: Lonyo

Originally posted by: Mrvile
Hmm doesn't really take a math wiz to figure this out though.

The 6800 core has an area of approx 500 sq mm. The 7800 core has an area of approx 625. The ratio between the two is 110:130, or 11:13. Now multiply 500 by 11:13 and you get about 423.078 sq mm. Multiply this by 2 and you get aobut 850, which is what would be required to run 32 pipes (assuming that there were no layers and whatnot). So no, the 7800 can't have 32 pipes )).

You are slightly wrong there.
You forgot that it's (11/13)^2, since it's sq mm not just mm.
Which is why a 90nm Athlon X2 core is about the same size as a 13nm Clawhammer core.

500 * 0.71 (11/13^2 approx) gives 350mm approx, or 700 for 2, which is still too much for the G70 to have double the number of pipes, I think.
BUT: The die isn't going to be made up just of pipes, so it depends on how much of the 500mm is pipes, and how much is other stuff like hardware for video playback or other tasks.

Originally posted by: jiffylube1024
Way too many variables. I'm sure there's more of a difference between the two than just pipelines. Not to mention the fact that both ATI and Nvidia's next cards are supposed to have architectural changes where pipelines aren't the same as before, eg they can be used for Pixel or Vertex shaders instead of one or the other.

I'll wait until they release spec sheets myself (not to mention some actual previews), but if anyone else wants to try to guess the number of jellybeans in that jar, go right ahead .

Err, no, they aren't on a unified architecture yet.
The R500 for XBox has one, no nVidia chips do yet (RSX or G70). The R520 doesn't either.

D'oh! I stand corrected. I knew I shouldn't have attempted math in the summer!

i did my mechanical engineering maths test the other week....i dont wanna see another differential equation again!

more on topic.....core sizes....layers? do they have it set up like a cake or something? ie like hardware TnL on one layer, then Pixel shaders on top of that, video processor on top of that....etc?

I thought the PCB's had layers, not the chips.
If chips were layered, heat would be a serious issue.
I remember Intel are looking into some forms of layering, mostly with RAM stuff though on top of the CPU die I think.
But AFAIK, it's PCB's which are layered and not the actual chip.

 

[trinibwoy]

Originally posted by: Lonyo
I thought the PCB's had layers, not the chips.
If chips were layered, heat would be a serious issue.
I remember Intel are looking into some forms of layering, mostly with RAM stuff though on top of the CPU die I think.
But AFAIK, it's PCB's which are layered and not the actual chip.

You're correct. The G70 PCB is rumoured to have more layers than those for NV40, for memory bus routing etc etc. There could be several metal layers on the GPU die (for signal routing as well?) but AFAIK the actual core logic is on a single layer.

 

[Elcs]

Is it me or are people running out of different things to say in G70/R520 threads? :|