Replies to post #3538 on Rambus (RMBS)

[elixe]

The memory has a bandwidth that's 50% larger than the FSB. That's lousy!

So why would anyone want XDR? ;-)
Clearly the implication is that Intel will eventually have a 12.8 GHz FSB.

Your speculation was that core speed couldn't achieve DDR2-800.

Geeze, I never said that. First of all DDR2-800 uses the same core f as DDR400. Prefetch is increased from 2 to 4 for DDR2. And DDR400 is in abundant supply.

What I do speculate is that as densities increase yields at 200 MHz core freq. come down. I expect much higher yield of 1Gb DDR3-800 @ 100MHz core than 1Gb DDR2-800 @ 200MHz core.

The only people making DDR2-800 will be companies like OCZ for the overclocker market

And considering that XDR runs at 200 MHz core, IMO it will be years before we see 1Gb XDR, if ever.

JMOs, though

[cordob]

Speaking of lousy, what about the FSB? It's a bottleneck. A 800 MHz FSB has a bandwidth of 6.4 GB/s while 1066 FSB has 8.5 GB/s. Dual channel DDR3-800 has a peak bandwidth of 12.8 GB/s. The memory has a bandwidth that's 50% larger than the FSB. That's lousy!

Plus that all the IO traffic has to go through the same channel... (well I will not bandy about names but you know where that is not necessary, LOL :)

Cheers
Corroller

(bought in-line rollerskates, man o man that was 35 years ago me on the ice...., don't laugh, practice a little daily will get there before I am 65, 2.5 years to go)