New DDR3 memory - very high memory latency (78ns) 6%- normal? Intel PC.

[David (PassMark)]

CPU-Z says "Dual" so I assume these are dual

Don't confused dual rank RAM with RAM in dual channels.
See
https://en.wikipedia.org/wiki/Memory_rank

Bad settings are more likely than bad hardware.

[Amphibia07]

Thanks David (PassMark)

CPU-Z says "Dual" so I assume these are dual, but I will try to install in different slots if that makes any difference. The identical RAM module on the chart is showing 28ns, so this does sound wrong. I just wonder is it common to have manufacturing errors resulting in high latency, or it's typically bad installation/settings.

[David (PassMark)]

You can find expected latency values in this chart
https://www.memorybenchmark.net/latency_ddr3_intel.html

75ns is high for latency. Something around 25 to 30ns would be expected.

Do you have the RAM in the correct slots to make sure it is in dual channel mode?

[Amphibia07]

Hi,

Need some advise. Upgraded recently to a new pair of Corsair Vengeance memory 2x8GB, CML16GX3M2A1600C10.

Memory is rated 1600MHz CL10 1.5V, checked Corsair page and it says "Tested Latency 10-10-10-27".

Performance Test however is giving a ridiculously low rating for Memory Latency, at 6%. Sure the PC is not the newest, and there are plenty of DDR4 memory around, still 6% looks suspiciously low. Both "memory latency" and "uncached memory read" are very low, 6% and 12%; all other benchmarks are at 50%+ including cached memory, which seem allright to me.

The PC is Intel i5-3470, HP Compaq Pro 6300 FF, I have read AMD PCs are slower, but this is Intel!!! Should support DDR3 1333/1600, CPU Z is showing the Mhz is closer to 1333 range than 1600, which I am still fine with, as this is not a performance desktop, only that 6% is seriously low.

Any idea - could it be a testing issue? Settings? Or a faulty ram module? On real world tasks I don't see any drop in performance, only this benchmark, and RMA would take 1-2 weeks, so I am wondering.

Thanks!