How bad of penalty/bonus would we expect PALOMINO on the PC800/1066 RD-RAM?

[MadRat]

[Before we begin lets make it clear that I am not saying it could happen or is even remotely possible do run any AMD cpu on RDRAM! This is just fanciful interest on my part.]

Lets say we could run RDRAM with the Socket-A Athlon family of processors. The front-side buses would be either 100fsb or 133fsb by conventional logic, perfectly matching interleaved RDRAM in the same way RAM is interleaved by the Pentium 4's 850 chipset. By tweaking the timing we could explore other front-side buses:

100fsb = PC800 (4 x 100MHz streams of data) /4
107fsb = PC800 (4 x 100MHz streams of data) /3.75
114fsb = PC800 (4 x 100MHz streams of data) /3.5
123fsb = PC800 (4 x 100MHz streams of data) /3.25
133fsb = PC800 (4 x 100MHz streams of data) /3
145fsb = PC800 (4 x 100MHz streams of data) /2.75
160fsb = PC800 (4 x 100MHz streams of data) /2.5

133fsb = PC1066 (4 x 133MHz streams of data) /4
142fsb = PC1066 (4 x 133MHz streams of data) /3.75
152fsb = PC1066 (4 x 133MHz streams of data) /3.5
164fsb = PC1066 (4 x 133MHz streams of data) /3.25
178fsb = PC1066 (4 x 133MHz streams of data) /3
194fsb = PC1066 (4 x 133MHz streams of data) /2.75
213fsb = PC1066 (4 x 133MHz streams of data) /2.5

Now we all know this isn't a picture perfect world. The RDRAM is known to have latencies that exceed DDR-RAM, making the latter more suited to Athlons. That doesn't mean we cannot think about the architecture though, so lets see what people have to say....

Basically, I am asking what would we expect out of the Athlon with the latency of RDRAM?

 

[MadRat]

Does anyone have any idea how to determine the penalty or bonus of RDRAM for a PALOMINO core?

 

[Locutus4657]

The only way to find out is to make such a platform, though I can't imagin any Athlon would pair nicly with RDRAM. The Athlon simply wasn't made to be used with this type of memory as the P4 was.



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