AMD's Quad-Core Barcelona: Defending New Territory
by Johan De Gelas on September 10, 2007 12:15 AM EST- Posted in
- IT Computing
AMD has made numerous improvements compared to the K8 core:
- The FPU unit can be turned off when not needed
- Clock gating is implemented much better
- Each core can run at its own frequency (but the voltage is the highest needed by either core)
- Power for the core and memory controller are split
We measured power consumption using two identically configured Colfax systems running Windows 2003 SP1 64-bit. The server configuration is listed below:
| AMD | Intel | |
| Motherboard | Supermicro H8DMU+ | Supermicro X7DBE+ |
| BIOS Revision | DMU8157v3.ROM | R1.3C |
| CPU | 2 x Opteron 2350 (2.0GHz) | 2 x Xeon 5345 (2.3GHz) |
| Memory | 8GB (8 x 1GB DDR2-667) | 8GB (8 x 1GB FBDIMM-667) |
| Hard Disk | 1 x Seagate Barracuda ES (400GB) | 1 x Seagate Barracuda ES (400GB) |
| Power Supply | 700W Redundant | 700W Redundant |
| OS | Windows Server 2003 SP1, 64-bit | Windows Server 2003 SP1, 64-bit |
At idle, the Opteron 2350 platform uses significantly less power than the Xeon setup, a decrease of about 44%. While Intel will be able to drop its power consumption with the move to 45nm, the impact won't be great enough to close this gap. The problem here is that Intel must use FB-DIMMs which consume significantly more power than AMD's registered DDR2, short of switching memory technologies there's nothing Intel can do.
| CPU | Idle | Load (Cinebench R10 XCPU) | Performance per Watt (Cinebench Score/Watts) |
| Dual Opteron 2350 | 188W | 299.9W | 41.9 |
| Dual Xeon 5345 | 257W | 347.3W | 47.4 |
Under load, the two are closer in power consumption with the Xeon only using 16% more total system power. Looking at performance per watt, Intel is actually ahead thanks to superior performance under the Cinebench R10 benchmark.
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kalyanakrishna - Tuesday, September 11, 2007 - link
I don't deny people use MKL ... I dont agree that anyone targeting performance on AMD Opteron will use MKL. No one running HPL/Linpack for Top 500 submission would use MKL on Opteron. No one who wishes to test his Opteron for performance would use MKL to do so. No one wishing to have the fastest possible results from his Opteron will do so.Even ISV's now provide code that is optimized for Xeon and Opteron separately.
JohanAnandtech - Tuesday, September 11, 2007 - link
Ok, point taken. Give us some time, and we'll follow up with new compilations of Linpack.kalyanakrishna - Wednesday, September 12, 2007 - link
Thank you. Appreciate the effort.leexgx - Monday, September 10, 2007 - link
and how offen do you read anandtechs Previews and reviewsunlike when intels core 2 came out all the hipe was real, to bad for AMD this time
this cpu is going to be good, problem is will it be able to compleat with Intels new cpu when it comes out
i still useing an amd system if your wundering and so all the rest of my pcs apart from my server as i just thow in an old P4 mobo to just file sharein house (all second hand parts apart from the hdds)
phaxmohdem - Monday, September 10, 2007 - link
I wonder if it would be feasible for AMD to take the Intel approach, and slap two of there new native quad cores together and release an octal core CPU in the near future. Or would they remain the multi-core purists they have become... Similarly I wonder if 2 65nm Barecelona cores could even fit under that heat spreader... or come in under an acceptable thermal envelope.Accord99 - Monday, September 10, 2007 - link
It won't fit on Socket F:http://www.madboxpc.com/news/am2/AMD_barcelona.jpg">http://www.madboxpc.com/news/am2/AMD_barcelona.jpg
fic2 - Monday, September 10, 2007 - link
Page 8, 3DS Max 9 last paragraph:"Dual 3GHz Opteron 2222 is capable of generating about 29 frames per hour", but then
"potential 3GHz Barcelona will be able to spit out ~35 frames per second". I think that is supposed to be ~35 frames per hour. Otherwise that is an extremely impressive speedup!
JohanAnandtech - Monday, September 10, 2007 - link
No, it is "per second". We used a Octalcore 2THz Barcelona there.... Thanks, fixed that one :-)
phaxmohdem - Monday, September 10, 2007 - link
Got SuperPi times for that beast? ;)Roy2001 - Monday, September 10, 2007 - link
Kentsfield has 2*143mm^2 dies. Barcelona is 280+ mm^2. Penry would be even smaller, 2*100 mm^2. So unless AMD can increase the frequency to 3.0+Ghz soon and price their new quad-core processors higher than Intel's, AMD would be still in red unless it oursouces Athlon 64 to TSMC.