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Can I (should I) do this????

post #1 of 5
Thread Starter 
Can I mix these??

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231416

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231460

Build - ASUS Sabertooth Z77
- Core i5 2500k

Do you guys need more info?

If not, who wants to buy the 1600's?

Thanks guys!
post #2 of 5
I guess my first question would be why would you want to? Why not buy the matched set? I'm sure you could mix them, bu they will each ahve to run at any given one speed, not at their each advertised speed.
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post #3 of 5
As Jolly Roger correctly points out they will have to run at the same speed (generally it's easier to just clock them both at 1600). That said, since you have a dual channel memory configuration you will only be reading and writing to one set at a time. As long as you keep the two sets paired with their matching partner you should be OK as far as overall synchronization is concerned. Mix them up and it would get ugly. Should probably be quite simple to OC the 1600 to 1866 though, but you might have to give it a little bit of voltage to match the timings the faster set is capable of. G.Skill RAM tends to OC well though so I wouldn't expect trouble there.

My real question is why would you want to do this? Running 4 DIMMs on a dual channel memory controller means you will have decreased memory throughput as data can only be accessed from one bank of 2 DIMMs at a time. If you're using up a significant portion of RAM already, then the throughput hit is OK to take, as RAM will still be hugely faster than your SSD/HDD. If you aren't using most of your RAM though, any memory setup that uses 4 DIMMs is going to slightly reduce your overall memory performance.

If you need both high throughput and 16GB of RAM, then you'll need to look into 8GB DIMMs. Unfortunately that will also mean higher prices and a lot more issues at higher speeds (not to mention less selection if you also like to keep voltages under control). For 90+ percent of consumers (even heavy gamers who maybe do a little photoshop now and again) 8GB of RAM should be plenty. My $0.02.
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post #4 of 5
Thread Starter 
Quote:
Originally Posted by RandomK View Post

As Jolly Roger correctly points out they will have to run at the same speed (generally it's easier to just clock them both at 1600). That said, since you have a dual channel memory configuration you will only be reading and writing to one set at a time. As long as you keep the two sets paired with their matching partner you should be OK as far as overall synchronization is concerned. Mix them up and it would get ugly. Should probably be quite simple to OC the 1600 to 1866 though, but you might have to give it a little bit of voltage to match the timings the faster set is capable of. G.Skill RAM tends to OC well though so I wouldn't expect trouble there.

My real question is why would you want to do this? Running 4 DIMMs on a dual channel memory controller means you will have decreased memory throughput as data can only be accessed from one bank of 2 DIMMs at a time. If you're using up a significant portion of RAM already, then the throughput hit is OK to take, as RAM will still be hugely faster than your SSD/HDD. If you aren't using most of your RAM though, any memory setup that uses 4 DIMMs is going to slightly reduce your overall memory performance.

If you need both high throughput and 16GB of RAM, then you'll need to look into 8GB DIMMs. Unfortunately that will also mean higher prices and a lot more issues at higher speeds (not to mention less selection if you also like to keep voltages under control). For 90+ percent of consumers (even heavy gamers who maybe do a little photoshop now and again) 8GB of RAM should be plenty. My $0.02.



I just didn't want the memory to go to waste.

Let me get this straight. My mobo can only handle dual channel memory. So, putting two (2) sets of dual channel memory in it would make it quad channel? And this will hurt my system? If I did do it is it going to be a pain in the ass? Do I need to reconfigure everything in BIOS?

I'm gonna be gaming mainly so I'm sure 8GB is plenty I just figured why not throw it in there so it doesn't collect dust.

Thanks for the answer guys!
post #5 of 5
Quote:
Originally Posted by CoolHandLuke630 View Post

I just didn't want the memory to go to waste.

Let me get this straight. My mobo can only handle dual channel memory. So, putting two (2) sets of dual channel memory in it would make it quad channel? And this will hurt my system? If I did do it is it going to be a pain in the ass? Do I need to reconfigure everything in BIOS?

I'm gonna be gaming mainly so I'm sure 8GB is plenty I just figured why not throw it in there so it doesn't collect dust.

Thanks for the answer guys!


Your memory controller is dual channel. That means that its only capable of reading/writing to one "bank" of two DIMMs at a time. If you have 4 DIMMs filled, then for all intents and purposes your memory controller must read data from 2 DIMMS, wait till the next clock cycle, and then read from the other two. In practice it's actually a great deal more complex than that, but you can see how having more DIMMs filled than you have memory channels available can measurably hurt your overall performance.

Since your memory controller (acutally built into your CPU die) cannot suddenly become quad-channel, you'll want to stick with a 2 DIMM configuration unless you're using so much RAM that your rig is starting to use your SSD/HDD for working threads. Even RAM that is running at reduced speeds is several orders of magnitude faster than SATA storage. My advice would be to try overclocking both sets and just use the one that you end up having the best luck with. You might be surprised to find that the 1600mhz kit actually OCs better. The silicon lottery is funny that way.
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Samsung SyncMaster SA550 (27in @ 1080p / 60hz) Corsair K60 OCZ ZX 850w Fully Modular (80+ Gold) Corsair C70 
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