Is mixing 1.35 and 1.4v DDR5 a terrible idea?

mid_gen · 17 Dec 2024 at 09:03

I've got 32gb (2x16) 1.35V DDR5 6000 at the moment, but I'd like an upgrade. I didn't really pay attention to the voltages when I built this system, but not it seems that a 32Gb 1.35v kit costs a £20 premium over 1.4v.

Would 1.35 and 1.4 play nice? Or should I just stop being tight and cough up....

mid_gen · 17 Dec 2024 at 09:34

Armageus said:
What CPU are you running?

You may need to stop being even tighter, and buy a 2x32GB Kit, as depending on the CPU you may not get rated speed with 4x16GB regardless of voltage.

AMD 7900(non-X). I'm not arsed about overlocking.

mid_gen · 17 Dec 2024 at 14:31

<grumbles something about the good old days when you just stuffed as many SIMMs in as you could get your hands on>

Think I'll just put with 32gb for now, not a problem just yet.

mid_gen · 17 Dec 2024 at 21:20

Reading a bit more.... I'm a bit peed off tbh. What the is the point of 4 slots on AM5 if you can't run more than two sticks of RAM? I bought AMD because I expected the socket to last for a while, but turns out you can't really upgrade the memory.

Should have gone Intel and stuck with DDR4 by the sounds of it.

mid_gen · 17 Dec 2024 at 21:53

Tetras said:
You can already get 2x48 and 2x64 is coming, so it should be feasible to upgrade into the longer-term. Future CPUs and BIOS updates may improve stability and performance.

If we reach a stage where you really NEED the 4 slots, the slow performance will be less of an issue than running out of memory, but realistically it'll be obsolete by then anyway.

What's the actual real-world performance hit from running 4 dimms at lower speeds? Having the physical ram is more important than raw speed, and much of my workload is Gpu (I don't game much)