using 2400 MHZ memory with 2800 MHZ memory?

[Harry Gumdropzap]

when I got my build, i got 2x4 GB 2800 MHZ when my CPU limited it to 2400, which it still does today
the reason i got it is because it was cheaper than the 2400 at the time, but now i want to upgrade with the same brand, same model all that, but the 2800 MHZ version has became more expensive
can i just use 2400 MHZ memory with the 2800 MHZ one, seeing how my CPU limits it to 2400 MHZ anyways

[Omega]

Your CPU didn't limit it to 2400Mhz it's your mobo. The memory frequency listed on your CPU's spec sheet is the speed the memory is guaranteed to run stable at.

If you buy a different model it may very well have different chips which will have a negative impact on performance and might impact system stabilaty.

[Harry Gumdropzap]

引用自 Omega：

Your CPU didn't limit it to 2400Mhz it's your mobo. The memory frequency listed on your CPU's spec sheet is the speed the memory is guaranteed stable to run at.

If you buy a different model it may very well have different chips which will have a negative impact on performance and might impact system stabilaty.

the motherboard supports 2666 mhz memory, the memory is 2800 mhz and the CPU limits it to 2400 mhz, otherwise the BIOS would say it was at 2666, and the memory itself was tested on another PC to check if it was 2800mhz, which it was meaning the only thing holding the memory back is the CPU

[Aliquis Freedom & Ethnopluralism]

Since the memory controller sit in the CPU I would say the CPU. Though maybe the options to change it just aren't showing on the other chipsets then again the motherboard supporting faster seem weird but no-one haven't even mentioned what ♥♥♥♥♥♥♥ cpu and chipset it uses so why guess and assume.

Usually you can mix around. I wouldn't worry much.

Regardless of which RAM you get assuming the board is fine with it possibly you could run them faster. And maybe not. Regardless of what RAM it is.

The 2800MHz may be more likely to do it and have heatsinks and an extreme (? OC?) memory profile for it.

[TehSpoopyKitteh]

If one RAM module is DDR4-2400...and the other is DDR4-2800...The maximum rate equivalent will be limited to DDR4-2400.

[igloosfolly]

It depends on rather the memory can be overclocked. All the more reason to never skimp on a good board all those extra bios options come in handy. But very true memory will default to the lowest speed.

[Bad 💀 Motha]

引用自 igloosfolly：

It depends on rather the memory can be overclocked. All the more reason to never skimp on a good board all those extra bios options come in handy. But very true memory will default to the lowest speed.

Or just don't waste your money on mixing RAM; instead buy all matching RAM, period.
Never mix RAM.

[Rumpelcrutchskin]

引用自 Bad_Motha：

Or just don't waste your money on mixing RAM; instead buy all matching RAM, period.
Never mix RAM.

Good advice.

[Harry Gumdropzap]

引用自 Bad_Motha：

引用自 igloosfolly：

It depends on rather the memory can be overclocked. All the more reason to never skimp on a good board all those extra bios options come in handy. But very true memory will default to the lowest speed.

Or just don't waste your money on mixing RAM; instead buy all matching RAM, period.
Never mix RAM.

the memory has the same CAS latency, timings, voltages all that
the only difference is the speed, which the 2800 is already limited to 2400 by the processor

[Omega]

引用自 Builderman：

引用自 Bad_Motha：

Or just don't waste your money on mixing RAM; instead buy all matching RAM, period.
Never mix RAM.

the memory has the same CAS latency, timings, voltages all that
the only difference is the speed, which the 2800 is already limited to 2400 by the processor

It's still best not to match RAM.

[Bad 💀 Motha]

引用自 Builderman：

引用自 Bad_Motha：

Or just don't waste your money on mixing RAM; instead buy all matching RAM, period.
Never mix RAM.

the memory has the same CAS latency, timings, voltages all that
the only difference is the speed, which the 2800 is already limited to 2400 by the processor

Yes but once ALL THE RAM is running at certain MHZ; those CAS timings WILL change based around this. If the RAM is say CAS-15 @ 2800Mhz; it will not be running at CAS-15 when u drop that 2800 RAM down to 2400Mhz; the CAS Timing profiles differ per MHZ