DDR5-6400 Memory Support

[jonbaldassar158402da]

I recently purchased the Corsair Vengeance Gaming PC i7500

VENGEANCE i7500 Gaming PC: Intel Core i9-14900K, NVIDIA RTX 5080, 32GB DDR5 6400MT/s Memory, 2TB NVMe SSD​

i9-14900
MSI Pro Z790-P WiFi
PNY NVIDIA RTX 5080
32GB DDR5 6400MT/s
I bought an additional 32GB or DDR5 6400MT/s. Does this motherboard support 4 memory modules @ 16GB each totaling 64GB?
Any input would be appreciated.

 

[victor.to151d02d6]

I recently purchased the Corsair Vengeance Gaming PC i7500

VENGEANCE i7500 Gaming PC: Intel Core i9-14900K, NVIDIA RTX 5080, 32GB DDR5 6400MT/s Memory, 2TB NVMe SSD​

i9-14900
MSI Pro Z790-P WiFi
PNY NVIDIA RTX 5080
32GB DDR5 6400MT/s
I bought an additional 32GB or DDR5 6400MT/s. Does this motherboard support 4 memory modules @ 16GB each totaling 64GB?
Any input would be appreciated.

With 4 memory modules at 6400 MT/s you are pushing the limit (putting more stress on the memory controller) if the memory modules are single-rank, but if the memory modules are dual-rank, you will exceed the maximum speed in the spec for your motherboard.

 

[citay]

If you require 64 GB total (which would only be necessary with professional workloads, for gaming it won't do anything), then it's better to swap the existing 2x 16 GB for a kit of 2x 32 GB. With four modules, you have twice the stress on the memory system, and then there is the potential problem that you might not be able to get the exact same modules again as your first two are. Then you also have mismatched modules, which provide additional challenges for the memory system, and the speed might not be attainable anymore (as it's only meant for two modules, not four). Also see RAM explained: Why two modules are better than four / single- vs. dual-rank / stability testing.

The 16 GB DDR5 modules should be single-rank, but that doesn't change the fact that nothing can be guaranteed anymore if you combine two kits of two modules each. And the chance of trouble rises considerably if the new modules are in any way different than the old, in regards to the ICs (memory chips) being used underneath the heatspreader.

Normally, for the RAM amount, you would first try to analyse how much RAM your heaviest workloads need, similar to here, and then go one step above it. For gaming and daily use, 32 GB total would be more than enough. With 64 GB, more than half of it would just sit there unused and just make things more difficult for the memory system.

Right now, most games run at their maximum performance with 16 GB RAM total already. Yes, you read that right, and it is because even the best gaming consoles only have 16 GB total RAM, and for most games, the console market it very important, so they make sure the games don't need more RAM.

Some games can benefit from a bit more RAM, but with 2x 16 GB those would already be well taken care of too. Then you could go up to 2x 24 GB, because those kits still use single-rank DIMMs, which tend to run better than the 32 GB (and up) dual-rank DDR5 DIMMs.

BTW, the BIOS should be updated to the latest version (very important for your 14th gen CPU). Sometimes, with these pre-built PCs, you can't use the MSI BIOS updates for the retail board, because they might have used a custom BIOS for your board, then you'd have to check with Corsair for updates. And then there's my Guide: How to set good power limits in the BIOS and reduce the CPU power draw, with which you can improve how the CPU is running.

 

[targ12f602ba]

Hello, probably you are very lucky, cause 4 DIMM modules actually could work in Gear 1 mode. This is absolutely necessary to have all DIMM's installed to get to that point.
If you wish to try this out then you must clock your RAM for its base clocks, like 4800 Mhz as they rated first, then enable System Agent Geyserville, then check out its voltage and turn it to Override mode cause its voltage could be too high in Auto mode. Probably you will even have to use offset settings like -100 from base voltage. Set also your RAM voltage to stock 1.1v to make sure it is fully stock. Then you could try to enable Gear 1 mode. At default speeds its about plus 1200 Mhz of speed. If you would want to overclock it then you will be must to use lower voltage then for Gear 2 cause it requires less for the same frequencies. Probably you could go higher then rated 6400 Mhz if your memory controller, RAM and motherboard would let you to do that. And use fan to cool your modules if possible. More information you could find here and there is no one else who succeed with this stuff. Otherwise you would stuck with what you have. Technically if your motherboard supports 7200 Mhz it could be not limit cause its rated for higher voltages, but since LPDDR5X working on lower stock voltages it works fine with 9533 Mhz speeds without any issues. For simplest Micron chips I have about 63 ns delay with much higher write and copy speeds then dual Gear 2 sticks. So if you would be using Hynix A-die this might greatly improve your bandwidth and reduce latency. Main feature of Gear 1 is lower voltages for the same speeds looks like manufacturer tells that you must use 1.4 volts, but for you could be enough like 0.2v less, so is you would reach frequency limits for your motherboard you could still press on timings as generic Gear 2 memory overclock and push latency as low as modules could work. For me it was about 59 ns with Micron chips on 5200-5400 Mhz with bandwidth of about 6600 Mhz Gear 2 modules of Read speeds and much higher for write and copy. I am using 4x16 Gb single rank modules. 64 Gb makes gaming experience smoother cause all that goes to RAM stays there as a cache, plus there another feature available to improve gaming with K series CPU's, but thi thread is about RAM. And yes, update your BIOS to latest version to prevent very fast degradation that ccould ahppen in months or weeks. Undervolting is also could be great, but fix troubles step by step if you don't need that right now.