Question Using ram with different MHz. Is it compatible?

Jun 19, 2019
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Hello so i was looking around and found some cheap corsair vengence (8GB) 2X4 with a speed of 2333 MHz. I have two sticks of corsair vengence (8GB) 2X4 with a speed of 2133 MHz. Would they work together even tho there is a difference in speed?
 

Lutfij

Titan
Moderator
List your specs like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:

Second, list the ram kits you have access to.

Third, I'd advise against mixing and matching ram(sticks) to get a cumulative number for the sake of performance.
 
Jun 19, 2019
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CPU: Ryzen 5 2600X
Motherboard: Asus Prime B350 - Plus
Ram: Corsair 8GB (2x4GB) DDR4 2133MHz CL13 Vengeance LPX.
SSD/HDD: WD Blue 1TB 7200rpm 64MB
GPU: MSI GeForce GTX 1060 3GB Gaming X
PSU: Fractal Design Integra M 750W
Chassis: Dont know what chassi it is. I bought it from a friend but its an ATX chassi.
OS: Windows 10 PRO 64 bit.


The ram the ram i have.

https://www.inet.se/produkt/6110152/corsair-8gb-2x4gb-ddr4-2133mhz-cl13-vengeance-lpx-svart


The ram im thinking of buy (if possible):


https://www.komplett.se/product/851529/datorutrustning/datorkomponenter/minne/corsair-vengeance-lpx-ddr4-2666mhz-8gb
 

AllanGH

Estimable
Mar 10, 2019
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That having been said, your best chance at getting them to work together would be to operate both sets of RAM at the lower, 2133MHz speed, and using the timings which apply to the lower speed DIMMs for all of the RAM.
 
Jun 19, 2019
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I did read that somewhere.
I wonder if its just better to buy 2X8 GB RAM instead if just buying a new set of 2X4 and maybe not having them work together.

Did some serching and found a set of 16GB for 85 dollars. Should i just do that instead?
 

Darkbreeze

Titan
Moderator
Yes, it is better to buy a full set in the capacity which you desire to run.

That being said, it is also a waste to buy sticks of that speed when they are going to run at the speed of the lowest installed memory module anyhow. SO, all your memory will run at the 2133mhz speed IF you also HAVE 2133mhz sticks installed along with the higher speed sticks.


if you are trying to get sticks to work in the same machine together that were purchased separately, even if they are otherwise identical according to the kit or model number or if they would seem to have identical timings and voltage requirements, there is a very good chance that you simply will not be able to do that. There is also a pretty fair chance that you might be able to if you are willing to take your time, listen to and understand what you are being told and follow the steps necessary to determining if they will "play nice" or not.

The exception in most cases will be that if the memory from both sets are the same speed and timings and both kits are within the JEDEC specifications for the default speed on that platform, so for example, 2666mhz on the latest Intel Z390 platform, 2133mhz on Ryzen first and second Gen platforms, then they stand a much better chance of working together but if they are higher speed kits the chances begin to diminish from what they might be at the low speed and loose timings end of the scale.

A word of advice. If you just purchased this memory, and for whatever reason you bought two separate sticks of the same memory instead of buying them together in a matched set, see if you can return them for a refund or credit towards buying a similar or same set of matched sticks that come together in a kit. It is ALWAYS better to have matched modules because from brand to brand, or even within the same brand, in fact, even when the part numbers are IDENTICAL, there can be anything from simply slightly different memory chips that were sourced from different bins at the end or beginning of a production run to entirely different configurations altogether even though the model numbers seem to be the same. Some manufacturers even reuse model numbers when they discontinue a product. Point being, memory is only the same for sure when all sticks came out of the same blister pack or packaging and were sold as a tested kit.

In order to determine if differences in the memory, or a need for increased voltage when using more than one stick (Especially if you are running three or more sticks) are responsible for the problems you are having you will always want to begin your troubleshooting process by attempting to boot the machine with only a single stick of memory installed. Also, for practically every consumer motherboard that's been sold since at least as far back as about 2014, the A2 memory slot which is the second slot over from the CPU socket, is THE slot that is most commonly designated for the installation of a single memory module. Slots A2 and B2 are almost always the slots specified in the motherboard memory population rules for use with two modules. If you need to install a third module I have no opinion on which of the remaining slots to use for that, but typically since the A1 slot is right next to the CPU socket and often interferes with the CPU cooler or fan, I'd say the B1 slot was probably just as good.

Honestly, I don't ever recommend that you HAVE three modules installed anyhow. Using memory in pairs is always a better option so that normal dual channel operation will occur. And that's another thing. When it comes to memory there are no "single channel" or "dual channel" memory modules. There are ONLY memory modules and the motherboard and CPU architecture will determine whether or not dual, triple or quad channel operation is possible based on the architecture and how many modules are in use. Occasionally though there are situations where it might make sense to run three modules and some boards CAN use three modules in a FLEX type mode where two of the modules will operate in dual channel while the third oddball module will run in single channel. I'd avoid oddball configurations though if possible because many motherboards will simply run ALL modules in single channel mode when an odd number of modules are installed.

If you think you will ever need 16GB of memory, then buy 16GB of memory from the start so you can get it all in a matched set that has been tested, and eliminate a lot of problems right from the start.
 
Jun 19, 2019
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Yes, it is better to buy a full set in the capacity which you desire to run.

That being said, it is also a waste to buy sticks of that speed when they are going to run at the speed of the lowest installed memory module anyhow. SO, all your memory will run at the 2133mhz speed IF you also HAVE 2133mhz sticks installed along with the higher speed sticks.
Thanks for the reply! Did read it all and after reading i will most likely just buy a new set of 16GB instead of taking the risk of them not working properly. Did get a lot of good info from it all! So thanks 👍
 

Darkbreeze

Titan
Moderator
Full version here. Might be worth reading just for future reference if nothing else.

 
Jun 19, 2019
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Full version here. Might be worth reading just for future reference if nothing else.

Will absolutely do that! Thank you so much for the help.
 

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