AMD Phenom Preview: Barcelona Desktop Benchmarks
by Anand Lal Shimpi on September 10, 2007 12:03 AM EST- Posted in
- CPUs
Barc Scaling: 2.0 vs. 2.5GHz
With two significantly different clock speeds on hand, we wanted to see how Barcelona performance would scale once AMD starts shipping at higher frequencies. At 2.5GHz we're running at a 25% higher clock speed than the 2.0GHz Barcelona, the chart below shows what performance improvement you get for the 25% increase in clock speed. Just as before, the benchmarks run are our standard CPU tests with the exception of the gaming benchmarks which are run at 1024 x 768 to ensure that they are CPU bound:
Even limited by its DDR2-667 memory subsystem, Barcelona scales well with clock speed. Windows Media Encoder, 3dsmax and Cinebench all scale almost perfectly with clock speed, and the rest of the tests aren't that far behind. Remember when we heard at Computex that Barcelona will really be competitive at higher clock speeds? It looks like this initial scaling data supports that theory, especially because Intel is very close to not shipping any mainstream desktop parts below 2.0GHz.
Facebook
Twitter
RSS
70 Comments
View All Comments
MadBoris - Monday, September 10, 2007 - link
hmm, especially if it is only @cas5, as mentioned above.It will be interesting to see if it yields anything more than just a few percent, as to scaling, and if benefits compound per socket.
As to one socket and 4 cores I don't really envision it being that much more than a few percent, but then again, I'm not investing any thought or speculation to try and figure out what will be answered when it actually matters and HW is available.
Major point for me is, being able to OC a q6600($280) to 3.2GHz - 3.4GHz on air is going to be real stiff competition for AMD's Phenom, as to my purchasing decisions, which is all I am concerned about mainly.
Also I believe all peoples talk about "true" quad is going to fall a bit flat for the majority of applications/games in real world comparisons with Kentsfield. Because already anyone that is interested to research it can see that the cache/bus penalties in scaling from 2 to 4 cores is basically nonexistent on applications that actually 'fully leverage' all 4 cores. Some apps will benefit, but I expect this to come to light before long and people will see that the penalty of 2 cores in one (Intel Quad), was more speculation, than actual reality, for 'most' consumer applications and games.
I do like AMD's advances but we seriously need more frequency, CPI cannot be overlooked.
duploxxx - Monday, September 10, 2007 - link
if AMD is already able to show multiple phenom systems on 3.0GHZ without dditional cooling (just boxed heatpipe cooler) then i wouldn't be too worried about oc performance of k10ilkhan - Monday, September 10, 2007 - link
15% over K8 is not going to be enough if it launches at (or at least doesn't overclock easily to) 3.2Ghz. At the 2.5 indicated here, yorkfield@3.2+ is going to eat agena for lunch, while being more profitable for intel than agena can hope to be for AMD.Pity.
JackPack - Monday, September 10, 2007 - link
Based on these numbers, consumers are likely going to stick with Intel quads.Clock for clock, Kentsfield was often >30% faster than Quad FX. Barcelona being 15% faster than K8 is reasonable but it's clearly not going to touch Penryn/Yorkfield.
duploxxx - Monday, September 10, 2007 - link
Alltough it is nice to see what anand tried to put here on electronic paper. I can't be compared to the real phenom in a few months.If you want to know why, check Anand's memory review of a year a go and check how well k8 and also k10 is scaling with better/faster memory.
in a barcelona rig you have reg 667@cas5.
so people who are already making conclusions on these benches, one reply: too early.
JackPack - Monday, September 10, 2007 - link
This isn't K8 though. The L3 in Barcelona is going to make it less sensitive to memory bandwidth and latency.Regs - Monday, September 10, 2007 - link
Memory hits and misses (latency) have nothing to do with the L3. The L3 is there as a buffer for the information being proportion to the 4 cores.JackPack - Monday, September 10, 2007 - link
Look up the term "memory hierarchy."Regs - Tuesday, September 11, 2007 - link
what do you think pulls the data into the L3? God?JackPack - Tuesday, September 11, 2007 - link
It's called prefetching. The data is in the L3 before the CPU needs it, reducing memory traffic and latency.Not only that, but Barcelona has a L3 latency of 20ns. To get data from the main memory, it has to go through all levels of cache. When you look at the cumulative latency of the memory hierarchy, the one or two cycle penalty of RDDR2 is trivial.