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It's very difficult to see anything in this picture except that the L2 cache is still 512 kB / core and the L3 cache is much larger than on Barcelona. By counting the L3 tags it seem to confirm a size of 6 MB...
It's very difficult to see anything in this picture except that the L2 cache is still 512 kB / core and the L3 cache is much larger than on Barcelona. By counting the L3 tags it seem to confirm a size of 6 MB...
Something is wrong. In Barcelona the single core is 6.5X a 256 KB L2 block +tags, in Shanghai only around 6X instead of the 9X figure with the reduction factors of 0.7 for logic and 0.5 for sram.
Shanghai cache seem larger than expected IMO, the whole chip seem too large. Looks like 260/270 mm2
Alberto.
Last edited by Alberto on Tue Mar 04, 2008 11:25 pm, edited 1 time in total.
Does anyone know what we can expect from Shanghai performance wise? Will it address whatever issues were plaguing Barcelona?
Barcelona was a huge letdown for me. I wanted to go back to AMD, but the performance just wasn't there.. :(
What the hell happened with Barcelona anyhow? It's barely faster than the K8!
Barely being 15-20% faster per clock than K8 on average and 40-50% in SSE intensive apps?
Barcelona is not a huge letdown,it was designed for servers primarily.It had its fare share of problems(TLB,low clocks) but soon this will be ironed out with B3 and 45nm transition.
Last edited by inf64 on Tue Mar 04, 2008 7:53 pm, edited 1 time in total.
Joined: Wed Aug 29, 2007 3:55 pm Posts: 797 Location: Great white north
Carfax wrote:
Does anyone know what we can expect from Shanghai performance wise? Will it address whatever issues were plaguing Barcelona?
Barcelona was a huge letdown for me. I wanted to go back to AMD, but the performance just wasn't there.. :(
What the hell happened with Barcelona anyhow? It's barely faster than the K8!
I wouldn't expect much of a frequency boost from AMD's 45 nm process
however this will be AMD's second crack at this microarchitecture so they
should be able to squeeze critical paths based on their experience with
the original 65 nm version. AMD should be able to ship quad server
parts at 2.6 GHz in 45 nm, maybe 2.8 GHz if they push really hard.
Does anyone know what we can expect from Shanghai performance wise? Will it address whatever issues were plaguing Barcelona? Barcelona was a huge letdown for me. I wanted to go back to AMD, but the performance just wasn't there.. :(
What the hell happened with Barcelona anyhow? It's barely faster than the K8!
I think I fell for the hype and was expecting Barcelona to trump Core 2.. Not that I'm an AMD droid mind you. I just don't want Intel dominating performance too much; although it seems thats the way it's going at the moment.
Paul DeMone wrote:
I wouldn't expect much of a frequency boost from AMD's 45 nm process however this will be AMD's second crack at this microarchitecture so they should be able to squeeze critical paths based on their experience with the original 65 nm version.
Paul, can you clarify what you mean by "squeeze critical paths?"
May seem so, but the cache sizes are confirmed here (and 1.648 V?)
CPU-z can't read Vcore correctly with Shanghai.
Today officials (AMD) said that 45nm chips would consume 15% less energy(even tho they feature 3x more L3 cache,so it's not a straight die shrink from 65nm) than 65nm parts,i presume per same clock.This explains the HKEPC slide claiming TDP drop from 125 to 95W for top speed bins(65nm-> 45nm).
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