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Technology Stocks : Advanced Micro Devices - Moderated (AMD) -- Ignore unavailable to you. Want to Upgrade?

To: Joe NYC who wrote (78537)	4/27/2002 10:13:04 AM
From: pgerassi	Read Replies (1) \| Respond to of 275872

Dear Joe: Re: "Better way to say this would be that AXP never takes the full advantage of PC-2100, only 1/1.35 effective, while Clawhammer will be able to take close to the max." No it isn't. People keep saying that NW@133/533 will have 4.2GB/sec bandwidth where the effective bandwidth is no where near this. AXP by the same benchmarks gets nearly 2.1GB/sec from PC2100. However in real world uses, both NW and AXP have much less than this. AXP gets more like 1.5GB/sec and NW will get more like 2.7GB/sec (being generous since NW does waste BW to reduce latency). AXP64 will get more like 2GB/sec effective from PC2100 and 3GB/sec from PC3200. As to AXP64 not supporting PC3200, I think that's Intel supporters wishful thinking. To support PC2100, PC2400 and PC2700 from AXP64, the memory speed must be handled by a divisor from clock speed. At 2GHz, PC2100 would use a 15 divisor, PC2400, a 13 divisor, PC2700, a 12 divisor and PC3200 would use a 10 divisor (remember the base DDRDRAM clock is 1/2 the transfer rate). DDR2 would just use different divisors and delays to set the timing and AXP64 should be able to support DDR2 unless major changes remove real grandfathering from the standard. Only divisor changes would be needed to support PC4200, PC4800, PC5400 and PC6400. The timing changes could be figured from the serial EEROM on the DIMMs. AXP64 could start them at PC1600 at boot and after reading them, move to the high speed mode. Further, BIOS settings could overclock the memory as is done now by altering internal registers of the DRAM controllers on the die. Pete