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Hello Kilian,
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<div class="">Regarding number of cores versus frequency, I would suggest going for more cores: some job types in RELION are not GPU-accelerated but scale very well with more MPI processes (motion correction, bayesian polishing and CTF refinement), so for those
you will benefit a lot more from having many cores than from having fewer faster cores. And 2.8-3.7 GHz is already plenty.</div>
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<div class="">Another general advice would be: don’t be cheap with RAM and storage, both in terms of speed and amount. Fast CPUs and GPUs are no use if you can’t feed them your data fast enough (they would spend a lot of their time waiting for inputs). The
amount of RAM is also easy to overlook, thinking you will only ever use RELION and cryoSPARC which can both use an SSD cache efficiently, but newer programs don’t always have this capability (I am thinking about cryoDRGN in particular), and it would be frustrating
to have to wait until they implement this or find workarounds (RAM upgrade, or not using your entire dataset, etc.) in the meantime. Last year I bought a workstation for the lab I work at with what seemed like a ridiculous amount of RAM, and this year I’m
thinking it was a good idea in hindsight, since I’ve been happily running cryoDRGN with large box sizes and many particles without any problem (besides that it takes a long time to run, of course… but I haven’t been limited by RAM when cryoDRGN loads the entire
dataset).<br class="">
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<div class="">I have no idea about your other questions, but there are probably compromises to make between all options (if not technical ones, at least in terms of budget).</div>
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<div class="">I hope this helps, good luck!</div>
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Guillaume</div>
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<div class="">On 20 May 2021, at 11:46, Kilian Schnelle <<a href="mailto:kilian.schnelle@uni-osnabrueck.de" class="">kilian.schnelle@uni-osnabrueck.de</a>> wrote:</div>
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Hello everyone,
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<div class="">I am currently thinking about which hardware to get for compute nodes mostly used for cryosparc and Relion with Sturm and would be glad if someone could give me an advice.</div>
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<div class="">I was hovering over maybe something like the G292-Z43 servers from Gigabyte with 2-4 RTX 3090, 64-128 GB Ram and a NVMe SSD for cache. (Someone actually has experience with an exported NVMe SSD cache for all nodes? Worth over having one in every
node?) I am not sure which CPU to get though I was thinking of:</div>
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<div class="">- 2x <span style="caret-color: rgb(0, 0, 0);" class="">AMD Epyc 7543 32c/64t, 2,8-3,7 GHz, 256 MB L3, ~3700$/each</span></div>
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<div class=""><font class="">Or higher frequency and less cores?</font></div>
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<div class="">- 2x <span style="caret-color: rgb(0, 0, 0);" class="">AMD Epyc 74F3 24c/48t, 3,2-4,0 GHz, 256 MB L3, ~2900$/each</span></div>
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</span></div>
<div class=""><font class="">Or even just a single socket CPU with a different server like the 7532P?(Would have to calculate the PCIe lanes I need for everything but, would PCIe 4.0 x8 or x16 for the GPUs even make a difference?, I mean its same as 3.0 x16
in throughput in theory)</font></div>
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<div class="">- AMD Epyc 7543P 32c/64t, 2,8-3,7 GHz, 256 MB L3, ~2700$</div>
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<div class="">Is it even worth going for the 256 MB L3 cache? Or is it worth going for Team Blue CPUs because of AVX 512?</div>
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<div class="">Any insides would be highly appreciated.</div>
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<div class="">Best wishes</div>
<div class="">Kilian</div>
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