different size ram sticks
- Thread starter jamm370
- Start date
Solution
Can try - no guarantees when mixing DRAM, if any problems, let us know the mobo, CPU and model numbers of the DRAM and we can try adjustments to get them to play 
Tradesman1
Legenda in Aeternum
- Jun 5, 2013
- 67,883
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Can try - no guarantees when mixing DRAM, if any problems, let us know the mobo, CPU and model numbers of the DRAM and we can try adjustments to get them to play
Cosmin Ciulin
Distinguished
- Feb 22, 2015
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- 18,530
The only thing to bare in mind, is the CAS delay timings and the frequency or speed they are running at. If for example this scenario:
1x4GB @ 800MHz with CAS 4
1x3GB @ 2100MHz with CAS 13
It will only pick the worst specs out of them, for example CAS 13 with the worst speed which is 800Mhz.
Just in case you don't know what CAS is, Column Access Strobe (CAS) latency, or CL, is the delay time between the moment a memory controller tells the memory module to access a particular memory column on a RAM module, and the moment the data from the given array location is available on the module's output pins. The higher the CAS number, the worst it is.
The lower the frequency (speed) the bad it is. For the best RAM option regarding quickest and lowest delay you would have to find one with a high frequency and a low CAS.
1 HUGE thing to keep in mind, is to look it is the same generation of DDR. Old pcs use DDR2 while newer ones use DDR3. Make sure you find out what motherboard ram generation you have before buying ANY ram.
1 optional thing is that there is also channels. So if you buy a 4xram sticks it will be working in a QUAD channel configuration. It will still work even if they are not setup for the same channel expect not as fast.
Here are some useful links from LinusTechTips, I recommend subscribing to him.
The more ram the better? https://www.youtube.com/watch?v=iYSG7gWfRTA
How much ram do you need? https://www.youtube.com/watch?v=ajyzZ-zaq0o
Ram upgrade guide: https://www.youtube.com/watch?v=oRCXYXszi8U
RAM Speed makes any difference? https://www.youtube.com/watch?v=dWgzA2C61z4
Memory channels: https://www.youtube.com/watch?v=-D8fhsXqq4o
If you plugged and didn't work out make sure to reply. Many more factors depend on what OS bit you have, what Processor bit you have and what motherboard, if it can support more than this and that, and processor voltages relating to RAM.
1x4GB @ 800MHz with CAS 4
1x3GB @ 2100MHz with CAS 13
It will only pick the worst specs out of them, for example CAS 13 with the worst speed which is 800Mhz.
Just in case you don't know what CAS is, Column Access Strobe (CAS) latency, or CL, is the delay time between the moment a memory controller tells the memory module to access a particular memory column on a RAM module, and the moment the data from the given array location is available on the module's output pins. The higher the CAS number, the worst it is.
The lower the frequency (speed) the bad it is. For the best RAM option regarding quickest and lowest delay you would have to find one with a high frequency and a low CAS.
1 HUGE thing to keep in mind, is to look it is the same generation of DDR. Old pcs use DDR2 while newer ones use DDR3. Make sure you find out what motherboard ram generation you have before buying ANY ram.
1 optional thing is that there is also channels. So if you buy a 4xram sticks it will be working in a QUAD channel configuration. It will still work even if they are not setup for the same channel expect not as fast.
Here are some useful links from LinusTechTips, I recommend subscribing to him.
The more ram the better? https://www.youtube.com/watch?v=iYSG7gWfRTA
How much ram do you need? https://www.youtube.com/watch?v=ajyzZ-zaq0o
Ram upgrade guide: https://www.youtube.com/watch?v=oRCXYXszi8U
RAM Speed makes any difference? https://www.youtube.com/watch?v=dWgzA2C61z4
Memory channels: https://www.youtube.com/watch?v=-D8fhsXqq4o
If you plugged and didn't work out make sure to reply. Many more factors depend on what OS bit you have, what Processor bit you have and what motherboard, if it can support more than this and that, and processor voltages relating to RAM.
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