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

To: Jim McMannis who wrote (35348)	7/31/1998 3:48:00 PM
From: Majic-	Read Replies (3) \| Respond to of 1574260

Slot A : 333 MHz BUSclock sound nice to you ? Michael da Kota, FHWL

To: Jim McMannis who wrote (35348)	7/31/1998 11:37:00 PM
From: Maxwell	Read Replies (1) \| Respond to of 1574260

Jim: <<<AMD claims that Slot A is superior to the P6 bus/Slot 1/2?. Why is this?>>> If you get a chance to pick up a Microprocessor Reports in October of 1997 there is an article on the Alpha 21264. If you study you will know why it is faster than anything Intel has. Here are some of the main points on Alpha bus 1) Bus is dual data rate with bus speed at 333MHz talking to CPU using a Tsumani chipset. On the other side you have 2 sets of SDRAM running at 100MHz. These two sets can transfer data simultaneously. It is equivalent to one set of DIMMs running at 200MHz. 2) Alpha SMP is different than PII SMP. In PII SMP, multiples CPUs share 1 bus that talks to the chipset. This means only 1 CPU can transfer at a time while the rest must wait for their turn. Alpha SMP on the other hand each CPU has its own bus talking to the chipset. Thus multiple CPUs can transfer data simultaneously. Thus in theory the performance of Alpha SMP is Performance Alpha = CPU1+ CPU2+ CPU3+ ......+ CPU(n) whereas Performance Xeon = CPU1+ x1CPU2+ x2CPU3+ ......+ xn*CPU(n) where x1<x2<x3, ..,<xn < 1 There are other minor differences but I am not sure how significant it is to add to the total performance. Maxwell