Can G70 use the new 700/800MHz GDDR3?

[Geo]

Mmmmmm, 520x24 vs 700x16 ?

Well, in the great game of liars dice, one must also note that "XTPE" is not on the roadmap yet either.

 

[Xmas]

Thanks.

So the 512Mbit chips could, literally, drop in as replacements for the eight 256MBit chips that currently appear on 7800GTX. Is that correct?

Jawed

Not exactly, as the new chips (256Mib: K4J55323QG, 512Mib: K4J52324QC) come in a 136-ball FBGA package, as opposed to the older K4J55323QF (256Mib) with a 144-ball FBGA. The new ones also allow a burst length of 8. But they're all x32.

 

[Jawed]

But apparently existing 7800GTXs also use the 136-ball chips

Jawed

 

[trinibwoy]

Well, in the great game of liars dice, one must also note that "XTPE" is not on the roadmap yet either.

Given the struggle for clocks on the XT, the PE is probably going to be a further respin or r580 based.

 

[Xmas]

But apparently existing 7800GTXs also use the 136-ball chips

Jawed

Which ones? The reference board clearly uses square 144-ball FBGAs.

 

[Jawed]

Ah yes, aha, I assumed the same data format (32-bit interface) meant the same number of balls. My mistake

How come the larger capacity chip has less balls?

Jawed

 

[Geo]

Must. . .not. . .make. . .steroids. . .joke.

 

[rendezvous]

How come the larger capacity chip has less balls?

There are more connections that are not used for power in the K4J52324QC (512 Mb) chips.

One more pin for selecting bank between eight banks instead of the four banks in the K4J52324QC (512 Mb chips). This could be a potential reason why a memory controller wouldn't be able to support higher density chips. That would however be a very short sighted design decision so i doubt that that is the case.

Then there are two more pretty uninteresting connections.

As to why the K4J52324QC has fewer balls, the K4J55323QF chip has more connections that are either used for power or not connected.

 

[_xxx_]

I completely forgot about the higher-clocked AIB models, in which case yeah, 480 or so does make no sense. I'd guess it's going to be ~520 or so.

Hmmm...coincidence?

 

[dizietsma]

If those Samsung chip numbers were right on the r520 shots then it maybe that nvidia will send out a XXX/1600Mhz part, if they are not conservative like Ati seem to be being.

Also, you'd have to think that if r520 has a vpu Mhz starting with 6 then for marketing reasons nvidia will at least have to have a card starting with 5, just for all those none obsessed people out there