Leaked - AMD Barcelona versus Intel Clovertown and Tigerton
[UPDATE 9/10/2007 - My leaked extrapolated scores below are now officially confirmed on SPEC.org for Integer and Floating Point. Since I only had two significant figures on percentage gain to work off of from the leaked slides, I was off by up to 0.3 which is to be expected. AMD's official Barcelona launch announced newer scores submitted on 9/9/2007 which are now one point higher on SPECint_rate2006 moving up to a score of 89 which isn't too much of a change. The SPECfp_rate2006 scores may have changed up half a point or so but it's hard to tell given the fact that AMD only gives two significant digits off their percentage gain.]
[Update 9/9/2007 7:30PM - IBM seems to have confirmed these leaked numbers with this PDF file labeled for release on 9/10/2007. The scores are for an AMD Opteron model 2347 1.9 GHz quad-core and they're a little lower than the Barcelona 2.0 GHz scores I extrapolated from the leaked AMD slides for Monday's Barcelona launch. It's still quite possible there are better scores for AMD's Barcelona but IBM's SPEC CPU 2006 scores seem to suggest that the numbes below are reasonable.
[Calculations on Intel advantage fixed at 7:30PM] IBM also gives us the single threaded results for SPEC CPU 2006 which allows us to see how fast each core can perform on its own. This is very important for desktop applications (like games) and even server applications because there are some tasks that will always be single-threaded by nature. From IBM's latest data, we can see that Intel still holds more than a 31.2% advantage on SPECint_2006 performance and more than an 18.2% advantage on SPECfp_2006 at 1.9 GHz. This is calculated by looking at the Barcelona 1.9 scores of 11.3 and 11.2 on SPECint_2006 and SPECfp_2006 versus an Intel E5335 2.0 at 15.6 and 14 adjusted down by a ratio of 1.9/2 which is conservative performance for Intel at a theoretical 1.9 GHz.
[Estimates of Barcelona over K8 advantage added at 7:30PM] Over an existing Opteron "K8" 2.0 GHz processor that gets 10.7 on SPECint_2006 and 10.9 on SPECfp_2006 adjusted down by a ratio of 1.9/2, the Barcelona 1.9 GHz core boosted SPECint_2006 by ~11% and SPECfp_2006 by ~8%. This pretty much confirms what I've been saying that Barcelona will not significantly improve single threaded IPC (Instructions Per Cycle) over AMD's K8 architecture.
Intel still holds a massive clock-for-clock lead when it comes to single threaded performance and this is primarily due to the 4-issue execution engine in Intel's Core Micro-architecture versus AMD's 3-issue execution engine. What allows AMD to narrow the gap when we get to multiple CPU sockets is the Integrated Memory Controller per Processor and HyperTransport memory architecture. But in order for AMD to beat Intel on performance, they will need to ramp their CPU close to 3 GHz but they have a long way to go at this point.]
It appears that some slides for AMD's Barcelona launch next Monday has come in to my possession and SPECint_rate2006 benchmarks were included. AMD caught wind that I was going to be analyzing and posting the leaked data and they just called me explaining that they wanted to give me some updated slides. I don't know exactly what it was but I know that some of the numbers posted for Intel on SPECfp_rate2006 were outdated. I explained that I never signed (or verbally agreed to) an NDA on these slides and I didn't intend to sign an NDA at this late point in the game and the gentleman from AMD was fine with that. But once I explained what I was going to do, AMD's rep asked me for 30 minutes to check on some numbers.When he called back, I never got any updated slides but I did get a strong hint that I might be posting inaccurate information on Barcelona performance and that maybe I wouldn't be journalistically accurate. The gentleman strongly hinted that the numbers may change on the official launch next Monday compared to the numbers that I've extrapolated for now. Now this sounded nothing like the first call and it sounded to me like AMD just didn't want the numbers posted. Of course it's quite possible that newer SPEC benchmark numbers were submitted and the slides that I have are using older numbers. Since the word "change" was used, that tells me that the numbers I have are legitimate but they may have been tweaked a bit since.Since the leaked slides indicated that the performance estimates were submitted to SPEC.org on 8/20/2007, that looks fairly new to me though it does not rule out the possibility of newer and better numbers for AMD. I *cannot vouch* for the accuracy of the Barcelona leaked numbers and I cannot rule out the existence of newer Barcelona numbers. But since the slides look authentic and the performance numbers are within the expected range, I've decided to post the performance numbers and let the reader decide if they're authentic or not.
