Can i combine CL7 and CH9 RAM

So long as you set the speeds to the slowest it should be fine (assuming it doesn't automatically!) The most important thing is that the voltage is the same.

Miles Hayler

Posted 2012-10-09T11:22:18.713

Reputation: 209

@Pezzzz for the voltage bet thing is to check the specification of the RAM. There are a few possible voltages that DDR1,DDR2,DDR3 RAM might have.. I wouldn't assume it based on which specific DDRx RAM it is. IT may be that there's a general rule that DDR1 tends to be this voltage, DDR2 this, e.t.c. but worth checking the voltage 'cos maybe sometimes a particular e,g, DDR2 could be a common voltage or could be a more uncommon voltage. – barlop – 2017-03-16T14:20:17.747

@Pezzzz look here https://en.wikipedia.org/wiki/DDR_SDRAM DDR1 could be either of "2.5/2.6" DDR4 could be voltage of either of "1.05/1.2" So don't just assume you know the voltage because of the DDR number. Check the voltage separately looking at the RAM specification. And check what voltage the motherboard supports too . And perhaps some RAM could be non-standard too,for some reason. Also sometimes people overvolt or undervolt..

– barlop – 2017-03-16T14:28:43.853

So voltage is determined by DDR3, which is the same on both. I believe that CL7/CH9 is the speed, is this correct? How would I set the speed? – Pezzzz – 2012-10-09T11:35:47.873

The speed is set in the BIOS and the speed and timings would be printed on a sticker the RAM itself. If you can find a model number for each type of RAM I can help that way. – Miles Hayler – 2012-10-09T12:24:58.800

I have added the speeds to the question. taking the advice of as few chips as possible; it appears to me that just keeping the faster bigger chips would be better than adding two extra slower chips. Does it look the same to you? – Pezzzz – 2012-10-09T13:08:51.790

If you were to add the extra 2 sticks, you would have to have them all running at 1066. Some programs will run quicker with more RAM, and some will run quicker with faster RAM. I assume you're running a 64bit version of Windows 7? – Miles Hayler – 2012-10-09T13:50:25.420

Yes I will be on windows 7. Currently I use the 21GB sticks in XP and have some memory issues with large Excel workbooks. I am upgrading to a new system with the 22GB sticks on Win 7 and am wondering if it is worth migrating the old RAM across with me. – Pezzzz – 2012-10-09T14:20:25.033

It's a job to say, it will vary from one program to another. Are you running a 64 bit version of Windows? – Miles Hayler – 2012-10-09T15:06:07.413

I will be running windows 7 64-bit – Pezzzz – 2012-10-09T15:15:20.760

I would give it a try then and see how it works out. What motherboard do you have? They'll need to be in matched slots... – Miles Hayler – 2012-10-09T16:10:03.840

As an aside, typically, the less RAM chips you have, the better access the CPU (motherboard) has access to. So, you'd be better off getting 1 x 4GB ram chip, middle choice would be 2 x 2GB RAM and least performance would be 4 x 1 GB RAM. Of course, it depends on the motherboard. – Dave – 2012-10-09T12:01:30.637

2x2GB would actually be faster assuming dual channel is used. – Miles Hayler – 2012-10-09T12:23:48.677

I never heard of CH... CL is CAS Latency http://en.wikipedia.org/wiki/CAS_latency and it's not the only property for a RAM that counts: http://en.wikipedia.org/wiki/SDRAM_latency#SDRAM_access & memory clock speed ... Anyway, I tell you one thing, you are light years faster with more RAM than with using the swap file on the disk. Don't worry about clock speeds. You're not running benchmarks on a computer all day.

– None – 2012-10-09T14:04:59.673

Your question is not clear. Please give exact model numbers. You have to explain what CL and CH memory is only because your incorrect usage of terms. – Ramhound – 2012-10-09T14:57:58.063

Can i combine CL7 and CH9 RAM

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