Some mainboard producers add a + to the specification of supported memory types (e.g. for ASRock X99 Extreme 3 supports DDR4-3000+). Does DDR4-3000+ somehow differ from DDR4-3000? The wikipedia article on DDR-SDRAM doesn't contain the sign+ or mention anything related. I don't see the difference reflected in selection filters in online stores.


The "+" usually indicates that the motherboard supports RAM with a frequency of over 3000MHz. The OC in brackets means that the motherboard allows the RAM to be overclocked. The caveats being that you may need to increase the voltage and/or the timings in order to accommodate the higher frequency.

This article provides a good explanation on memory timings (e.g. 9-9-9-24):

Memory Timings/Latency Expalined

  • 1
    "The caveats being that a higher overclock/frequency will result in an increase in voltage and latency (in most cases)." The latency is measured in cycles(not time) for SDRAM, so the actual latency depends on latency number / the frequency you can reach. – rsaxvc Feb 14 '15 at 21:06
  • I didn't say it's measured in time. I simply stated that a greater overclock will have an adverse effect on latency. – Yass Feb 15 '15 at 1:38
  • That's just it, overclocking means you may need more latency cycles, but not actually more latency. 2 cycles at 100MHz is the same latency as 3 cycles at 150MHz. If you can run at 125MHz with only 2 latency cycles, the latency has decreased rather than increased. (Everything else in your answer I agree with and was helpful) – rsaxvc Feb 15 '15 at 18:33
  • So, are you saying I should change my answer to say latency cycles, instead of just latency? – Yass Feb 15 '15 at 19:24
  • 1
    I would just mention that you'll likely need to adjust the timings and/or voltages along with the new speeds. – rsaxvc Feb 15 '15 at 23:58

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.