Re:AMD EPYC Performance Testing with systemd
by cesarb on Thursday July 12, 2018 @08:00PM
(#17519593)
The trick is not to max out in RAM, but to use all the channels. So for a processor with 4 RAM channels, instead of a single 32GiB DIMM, you should use four identical 8GiB DIMMs.
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Re:AMD EPYC Performance Testing with systemd
by geezerjay on Friday July 13, 2018 @05:09PM
(#17526714)
That's solid advice if you're aiming for performance. If you're aiming for performance per buck at the expense of today's performance then it's far better to spend the bare minimum on a fewer but large-ish DIMMs and max out on RAM when your wallet recovers from the initial hit.
Sometimes you don't notice the impact on performance, but you do notice doubling or quadrupling your RAM with a fraction of your initial budget.