Re:AMD EPYC Performance Testing with systemd
by elorant on Thursday July 12, 2018 @06:21PM
(#17519104)
Well, let's see. A TR4 mobo can host 8 dimms. Say you want to max out in RAM that's a minimum of $1100. Add at least 10% if you go for ECC modules. Eventually you end up paying for RAM more than what you pay for the CPU. That's why a lot of people are conservative with RAM when they build a new rig. Somehow it doesn't feel right to pay that much money for memory. So you buy the bare minimum and then wait for prices to normalize, which seems like taking forever in this freaking industry.
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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.
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.
Re:AMD EPYC Performance Testing with systemd
by dabockster on Thursday July 12, 2018 @07:35PM
(#17519487)
RGB > ECC
Prove me wrong.
Re:AMD EPYC Performance Testing with systemd
by coherentpony on Thursday July 12, 2018 @08:09PM
(#17519635)
ECC has a technical benefit whereas RGB has no benefit at all unless you prefer your DIMMs to look like Christmas tree ornaments on acid.
Re:AMD EPYC Performance Testing with systemd
by dabockster on Monday July 16, 2018 @07:19PM
(#17546008)
> you prefer your DIMMs to look like Christmas tree ornaments on acid
This is a technical benefit.
Re:AMD EPYC Performance Testing with systemd
by berbec on Thursday July 12, 2018 @09:37PM
(#17519937)
Isn't every blinking light a gigaflop?
Re:AMD EPYC Performance Testing with systemd
by dabockster on Monday July 16, 2018 @07:18PM
(#17546002)
Yes, plus an additional 100 FPS in games.