RAM Speeds

[Steve Rowe]

Hi,

Has anyone done any direct testing of RAM type / speed on the performance of TM1? DDR4-2933 is over twice as "fast" as DDR3-1333 for example. How does this translate into TM1 performance? Assume the motherboard etc changes as appropriate.

Any well informed views?

[tiagoblauth]

No, but I can help on TM1 parallel processing using TurboIntegrator if that is your problem.

[qml]

Because as RAM clock speeds go up each operation takes more clock cycles, increasing the relative latency, therefore you cannot expect to double your performance. A more realistic outcome would be a 10-20% improvement, depending on many additional hardware and software factors.

[jim wood]

Because as RAM clock speeds go up each operation takes more clock cycles, increasing the relative latency, therefore you cannot expect to double your performance. A more realistic outcome would be a 10-20% improvement, depending on many additional hardware and software factors.

That depends on the CAS (timing) rating of the modules. Larger sizes (32GB) tend to have a worse CAS rating, so don't just look at the frequency, check the timing. Also ECC adds another factor. If you want large modules, with high speeds, low latency and ECC you're going to be spending some good hard cash. Oh and I've not even factored the channel support from the motherboard.

[Steve Rowe]

Errr thanks....
So we could get 10%-20% improvement.

Jim, is your piece offering detail on Kamils "depending on many additional HW and SW factors" or are you putting doubt on the whole 10%-20%?

Hopefully we can at least say it won't be worse....