Replies to post #15640 on Advanced Micro Devices Inc (AMD)

[dougSF30]

sgolds, 6. It will be faster for 2-DIMM (4-bank) solutions; registered DDR does not degrade when you add DIMMs so if the user puts in more than 2 DIMMs then DRAM performance will be below socket 940. Most users will use 2 DIMMS and get a speed boost.

It's not clear to me that 2 DIMMs will be the limit for top speed with Socket 939.

What we know is that the single-channel Socket 754 Athlon64 boards run at full speed with 2 DIMMs, and slow down when a 3rd DIMM is added.

So, perhaps 2 DIMMs *per channel* can run at full speed, even when using unregistered DIMMs.

That would mean 4 DIMMs would be just as fast with a Socket 939 board.

At any rate, at least with 2 DIMMs, and possibly with 4, Socket 939 FX systems are really going to fly. All the low-latency of Socket 754, and all the bandwidth of Socket 940.

Doug

[yourbankruptcy]

socket 939 and 256k cache. I understand that they are unrelated. But in fact they are :-)

AMD can't make volume A64 on 130 nm without moving 80% of chips to 256K. The chip with 256k may not compete with 3.2 Ghz P4 unless it is in socket 939.

AMD must sell 400K of A64's this quarter. That's not that much.

But in Q104 they plan 300K for the 939 pin version, and 1320K for the 754 version. That's a big challenge.