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Upgrading my memory

Last response: in Memory
September 7, 2011 12:50:00 AM

Hi guys, I have some simple question I wanna ask before buying anything.

Right now, my PC has 6 (3x2) gb of RAM with a CAS Latency of 7 with 7-7-7-18 timing and a speed of 1333 mhz

here's the link :

I'd like to upgrade to 12 gb by buying 8 gb (2x4) of RAM of CAS Latency 7 with 7-7-7-21 timing and a speed of 1066 mhz.

here's the link :

I would replace one stick of to gb by one stick of 8 gb and put the other 8 gb in the remaining slot.

My questions are :

What is the difference between a timing of 7-7-7-18 and 7-7-7-21 ?

Is the speed an important thing to consider ? Is 1333 over 1066 is worth the extra 30$ ?

Also, if two sticks are slower will they limit or will they be compatible with the faster ones ??

Finally, do you think it's a good idea to do this or should I buy memory with the same speed and timing ? Will it bother at all ??

More about : upgrading memory

a b } Memory
September 7, 2011 1:17:12 AM

Neither the timings nor the frequency of DDR3 RAM makes a whole lot of difference in system performance. You do NOT want to buy 8 GB. to add to your system. RAM is so cheap right now you should buy a Matched, Tested 12 GB. Kit as mixing of RAM is never recommended and unlikely to work without issues.

Best solution

September 7, 2011 4:36:08 PM

You don't want to mix ram just like beenthere said if you can help it.

If you want more ram than 6 gb than get two of these and sell your current ram for like 20-30(maybe more) bucks then you can get 16 gb of ram. IMO unless your doing photo editing/3D editing things than I wouldn't recommend more than one 8 gb set. $39.99 for 8 gb of DDR3 1333 RAM is good value.

Here's a good deal but it ends today so jump on it. It's 2x4gb set you can get two of them for $79.98(with $10 worth of promotional codes) with free shipping :)
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September 7, 2011 5:00:13 PM

I'm in Canada so I don't have the 5$ rebate.

If I buy this model :

Model F3-8500CL7D-8GBRL
Capacity 8GB (2 x 4GB)
Speed DDR3 1066 (PC3 8500)
Cas Latency 7
Timing 7-7-7-18
Voltage 1.5V

Will it fit with my current memory which is :

Model F3-10666CL7T-6GBPK
Capacity 6GB (3 x 2GB)
Speed DDR3 1333 (PC3 10666)
Cas Latency 7
Timing 7-7-7-18
Voltage 1.5V – 1.6V

They have the same timing... or should I get this one :

Model F3-10666CL7D-8GBRH
Capacity 8GB (2 x 4GB)
Speed DDR3 1333 (PC3 10666)
Cas Latency 7
Timing 7-7-7-21
Voltage 1.5V

It has the same model number and same speed.....but different timing. I'm a little bit lost honestly between all this.
September 7, 2011 5:54:57 PM

Ooh and by the way, my mobo is an ASUS M4A89GTD Pro/USB3 which work only in dual-channel operation. Am I doing something wrong here by buying three sticks of memory or should I get four stick ? Or maybe keep 2 of my 2gb stick then add 2 x 4gb stick in the remaining slot ?
a b } Memory
September 7, 2011 6:25:33 PM

With dual channel mobos use two or four memory DIMMs for dual channel performance other wise your system will be slower if you use 1 or 3 DIMMs.
a b } Memory
September 7, 2011 9:34:00 PM

If your motherboard only works in dual channel mode then you need a fourth stick identical to the third.

Preferably from the same kit because there is no guarantee it will work otherwise.
September 21, 2011 2:45:58 PM

Best answer selected by Furieux.