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Message boards : Number crunching : CPU benchmarks

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Mitch
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Message 71189 - Posted: 30 Nov 2013 | 7:11:05 UTC

I searched the forum for benchmarks and cpu benchmarks and came up with little on the subject. I'm looking into building a "low" power rig using itx blades in a rackmount chassis. I'm going intel LGA1150 for this build as their TDP is hard to beat from AMD. My research has been on cpubenchmark.net but is there a running list on real world boinc benchmarks? I'm interested to see some numbers, especially in the lower TDP chips like the i5 4570 S

Here's what I'm actually running now, but have no clue how these numbers stack up against anyone else (BOINC benchmark used):

AMD A6-5400k (65-watt TDP)
2 cores @ 4.30GHz
3141 floating point MIPS
11311 integer MIPS

Intel XEON E5405 x2 (80-watt TDP each)
8 cores @ 2.00GHz
2010 floating point MIPS
9408 integer MIPS

Intel XEON E5345 x2 (80-watt TDP each)
8 cores @ 2.33GHz
2210 floating point MIPS
12262 integer MIPS

Intel Pentium B960 (unknown but whole laptop only pulls 30w through meter)
2 cores @ 2.20GHz
2192 floating point MIPS
6901 integer MIPS



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Message 71194 - Posted: 30 Nov 2013 | 12:24:13 UTC

It depends on WHICH "real world" you're interested in. I.e., which BOINC project you're going to crunch and even which sub-project.

If you're going to run CPU tasks at PrimeGrid, you'll probably want to stay away from AMD because their implementation of the AVX instructions is very poor. So poor, in fact, that there's no speed benefit in using them. On the other hand, on Intel processors, LLR, PFGW. and the CPU version of Genefer can see as much as a 40% increase in speed when using AVX instructions. ("Your mileage may vary" as this is also affected by memory architecture as well as how many cores are running.) At PrimeGrid, AVX is currently the holy grail, and AMD simply is not currently a player in that arena. So the choice between AMD and Intel is a simple one. AMD's only attraction is that they're cheaper.

Power usage (and heat) also goes up when running the AVX versions of those programs, so I don't know whether the power to speed ratio goes up or down when using AVX. The speed certainly goes way up.

On the other hand, if you're running sieves at PrimeGrid, AVX is not used. However, hyperthreading is useful for sieving (but not for LLR, PFGW, or Genefer).

Most people are interested in raw speed and not all that interested in power consumption, so you may have difficulty finding a comprehensive list that compares the power consumed vs. speed. There's a few data points scattered around on the forums, but no big list specifically talking about TDP vs. speed with actual apps.
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Message boards : Number crunching : CPU benchmarks

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