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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: kash johal who wrote (52881)	3/18/1999 7:48:00 PM
From: Scumbria	Read Replies (1) \| Respond to of 1578756

Kash, Let's assume that K7 is 30-40% faster than equivalently clocked Xeon. I will be very surprised if K7 is more than 10% faster on integer code than Xeon. It may even be slightly slower than Xeon at the same clock speed, due to the longer latency L1 and L2. (This would be more serious except for the fact that it is mitigated by a larger L1 on K7.) The AMD's will use interleaved memory as I understand it. Does that mean for a server that one needs 2x this memory for K7. Everyone uses interleaved memory these days. I believe that K7 is using a LOI (low order interleave) scheme. The bank select changes as you walk through sequential addresses. The choice of LOI vs. HOI makes no difference for the amount of DRAM required. It does affect page hit rates, resulting in differences in latency. I'm not aware of anything about K7 which inherently requires higher system costs than Xeon. Scumbria

To: kash johal who wrote (52881)	3/18/1999 8:00:00 PM
From: Tenchusatsu	Respond to of 1578756

<The AMD's will use interleaved memory as I understand it. Does that mean for a server that one needs 2x this memory for K7.> No. Remember that the Xeon servers with the 450NX chipset uses EDO DRAM. (Kinda weird, no?) That EDO DRAM has to be interleaved in order to feed the 100 MHz processor bus. Interleaving is pretty trivial on servers because you're going to have a large number of DIMM slots anyway. Like you said, servers with a gig or more of memory is pretty common. If you use 128 MB DIMM's, you'll have to support eight of them just to get to a gig. You can interleave those eight DIMM's into two (or more) 100 MHz channels in order to feed the K7's 200 MHz processor bus. Tenchusatsu