8-core low-power Opteron 6128HE for $54 with free shipping

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dba

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Feb 20, 2012
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Probably everyone knows that I'm a fan of Opteron server CPUs for excellent memory bandwidth, high core count, and good IO for a very low price - emphasis on the low price part; recent Xeon CPUs are far better if you remove $ from the equation.

The killer Opteron deal has long been the 6128 - eight cores for around $40. The only downside is that power consumption is high - 115Watts TDP. There has always been a low-power version of the 6128, but it has long cost several times more money. Until now.

I just bought a pile of AMD 6128 HE CPUs for $54 each, and there are many left at that price. http://www.ebay.com/itm/350706540994

If you thought the quad-core Xeon L5520 was a deal at $45, then you'll love these - eight cores for $54. The "HE" in the name indicates that this is the low-power version of the 6128 CPU. TDP is 85 watts, compared to 115 watts for the standard 6128 CPU and - for comparison - $90 and 120 watts for a pair of Xeon L5520s with the same number of cores, though with HT.

Of course you'll need an AMD G34 motherboard to take advantage of this offer. I'm stuffing eight of them into one of the Dell c6145s that I bought from Vista Computer. That's a ready-to-run (except for RAM) server with eight CPUs, 64 total cores, 64 DIMM slots, eight x16 slots, four x8 slots, and 24 disk bays for a grand total of $782 including rails. Maximum disk IO should be around 22GB/Second.
 
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Patrick

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And you can get 4x 12 or 16 core CPUs for a lot less than $3500 also :)
 

mrkrad

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Oct 13, 2012
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Per dollar how does this compare to L5639 $135 ?

Is there a cheap 4-way setup? I'd love to have your setup with all those card slots.
 

dba

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Feb 20, 2012
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Per dollar how does this compare to L5639 $135 ?

Is there a cheap 4-way setup? I'd love to have your setup with all those card slots.
My cheap 4-way setup is a pair of dual-node Dell C6145s that I bought for - if I remember correctly - $325 each. That's $650 total for 16 CPU slots (four slots per c6145 motherboard) and 128 DIMM slots with a total of 20 x16 PCIe slots and eight IO controllers between them. Buying 16 server CPUs can get expensive, so the cheap 8-core opterons were a lifesaver. Total CPU cost? $864.

As for benchmarks, the Opteron 6128s are shockingly slow per thread compared to good Intel chips, but in embarrassingly parallel and IO heavy workloads like my data warehouse, they make up for it with core count and massive memory bandwidth. In my setup, four 6128HE CPUs for $216 gets you almost 100GB/S of memory bandwidth and 32 true cores, which is enough to pull every last bit of performance out of the five LSI controllers I have installed per server, with tons left over to shove the results out a QDR Infiniband port. In fact, I have no incentive to upgrade to 12 or 16 core Opteron CPUs because I don't have enough IO to keep them busy.

The cluster isn't ready yet, but I expect (based on small scale tests) to get single-query throughput of 28,000 MB/Second, which with compression could be up to 5 billion rows per second.
 
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PigLover

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Jan 26, 2011
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Unfortunately, cheap C6145s don't seem to be on the market anymore. At present barebones are about $800 on fleabay.