Itanium Retreats To Multis, Opteron Presses Attack

vincecate writes " Back in 1997 Itanium was presented as a compatible extension of x86, and Intel had dreams of replacing high end x86 by 1999 (about min 16 in link). However, the original 2001 Itanium had the 32-bit performance of a much older Pentium so Itanium is viewed as non-compatible. Now with the rise of what Microsoft is calling the "x64" architecture (AMD64 and EM64T), Itanium has been repositioned to the multiprocessor server market."

However, Opterons are designed for multiprocessing. Each has its own memory and built in hypertransport links to make NUMA multiprocessors. So existing Opterons don't need large expensive caches like Xeon MP, nor any glue chips for up to 8-way multiprocessors. This has started the commoditization of multiprocessors. You can now buy a 4-way Opteron for $6000 or an 8-way for $10,000.

There is an interesting interview with Tyan CEO and his assistant that give some info about future Opteron plans. People are working on 8-way motherboards that will become 16-way when duel-core Opterons come out. They also say that the next Opteron core, the K9, will be able to 'go over 60 processors without adding any external crossbar chips.' Another fun plan mentioned is connecting the hypertransport links using fibers for really large systems."

Comments

x86 code size advantage over Itanium

[vincecate]

It is reported that IPF executable images are typically three times the size of equivalent Alpha executables. I used crosstool to make a gcc cross compiler, and found Itanic (IPF) code to be twice the size of AMD64 code. This is a significant architectural price/performance difference when it comes to either cache size or memory bandwidth, and no doubt part of why Itanics are so expensive.

Re:Intel attempts to move away from x86

[questionlp]

Although AMD is not directly aiming the Opteron at the Itanium (instead it's aimed more towards the Xeon DP and Xeon MP), the Opteron can be very competitive against the Itanium in a fair number of scenarios. There are some places where the Itanium will beat the AMD in performance, but it also costs more. For instance, the Itanium (with a bit of help from SGI) can scale into the hundreads of processors and still be able to run a single kernel image. Right now, that isn't exactly doable with the Opteron.

Intel is aiming their Xeon with EM64T at the Opteron while pinning the Itanium against Sun's UltraSPARC, IBM's POWER, etc. Unfortunately, the Itanium is also used as a replacement for the PA-RISC and the Alpha :\

I favor the Opteron over the Itanium because of backwards compatibility without performance problems, lower cost, lower power consumption and better I/O and memory throughput.

I have bashed the Itanium in the past... but I still think it is a bit too early to sent it crashing towards an iceberg and sinking it soon. It does have it's good qualities, but also a fair amount of downsides.

Ready... FIGHT!

[Mr. Flibble]

People are working on 8-way motherboards that will become 16-way when duel-core Opterons come out.

That will be soo cool when we have duel core opeterons. Can you imagine 16 opetrons dueling it out in your case?

Cool! Wicked Awesome!!!

What? A typo. Oh. Err... I knew that...

Itanium, Opteron related news...

[hoggoth]

Itanium Retreats To Multis, Opteron Presses Attack.
In related news, Megatron Retreats to Cybertron, Optimus Prime Presses Attack.