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Sandy Bridge RAM-memory help

post #1 of 10
Thread Starter 
Hi, I'm about to buy a Sandy Bridge system with i7-2600K and planning to overclock it pretty much with a H70, but I'm unsure what memories to choose.

First of all, I live in Sweden and can't buy any G.Skill memories here, so no need to recommend them, but they seems to be really nice and I would really like to buy them if I could, but the only I can choose from now is Corsairs memories.

I want 8GB (2x4) and I'm unsure if I can use a 1.65V memory together with SB or if I should buy a 1.5V memory just to be safe, and what speed (1333MHz or 1600MHz).
Is there a big difference between 1333Mhz and 1600MHz or won't I notice the difference?

Thanks, sorry for my English
post #2 of 10
I have old DDR2-800 RAM, so I can only give you limited advice. I personally never really noticed a different between 800 Mhz and 1066 Mhz, but I don't know if there'd be a noticeable difference between 1333 and 1600. I'm sure 3DMark would notice though.

And as for the voltages, you'll be fine getting 1.65v or 1.5v. The RAM voltage isn't really anything that matters unless you wanna OC it alot. 1.65v just means that's how much it uses to run. Your SB voltage is a totally different number, it doesn't have anything to do with the RAM voltage. The 1.5v RAM will overclock better, because it's able to use less energy giving you room to give it more, and the 1.65v will do it less because it requires more.
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post #3 of 10
Corsair RAM is pretty good too.
If you're planning to OC it, you'll have to buy a P67 based motherboard, and so, you can choose to buy higher speed RAM, like 1866/2133MHz Kits, if your budget allows it. If not, choose a 1600MHz Kit, with CL7 or CL8 latencies. It's not like you'll notice a huge difference, but it does make some. About 1.5V or 1.65V, it depends on the kits. theoretically, 1.5V kits have a bigger OC headroom. IF you can find a 1600MHz CL7 1.5V memory kit, you should definetely buy it
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post #4 of 10
Thread Starter 
Ok, I'm thinking of getting the 1600MHz ones, either XMS3 that runs at 1,65V or Vengeance that runs at 1,5V.

From what I've read you shouldn't use a RAM that runs over 1,5V on Sandy Bridge or something like that.
Edited by flaxe - 1/29/11 at 1:20pm
post #5 of 10
1.65v will work with sandybridge setups. Much like Matrokska said 1.65v will work fine but will give you less headroom when overclocking. If you plan on OCing your RAM a decent amount shoot for lower voltages. Also make sure your RAM has decent timings. Anything CL8 or lower and I would at least shoot for 7 - 8 - 7 times RAM. That timing seems to be well priced for most manufacturers.

If you know which motherboard you plan on buying most have lists that tell you which models are RAM are compatible. I know ASUS does this on their main website.

I would shoot for these
http://www.corsair.com/memory-3/inte...m2a1600c8.html
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post #6 of 10
Quote:
Originally Posted by flaxe View Post
Ok, I'm thinking of getting the 1600MHz ones, either XMS3 that runs at 1,65V or Vengeance that runs at 1,5V.

From what I've read you shouldn't use a RAM that runs over 1,5V on Sandy Bridge or something like that.
Between those 2 i would go with the Vengeance kit.
Where did you read about the mems voltage with sandy bridge? Memory voltage has nothing to do with CPU, it is related to wether your board can handle that stick, @that speed, @that voltage.
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post #7 of 10
Thread Starter 
I haven't thought of overclocking the RAMs, but I will probably do a little on them. Mainly I was going to just overclock the CPU.

About the RAM voltages, I've probably misunderstood... I've just read at some different places that Intel recommends 1,5V and that 1,65V and above can damage the CPU (or motherboard?), but maybe I've misunderstood it all?

The motherboard I'm planning to buy is the Asus P8P67 Pro. I looked at the "qualified memory list" and the two memories that I linked (XMS3 and Vengeance) are compatible.

The price difference between the XMS3 and Vengeance (9-9-9-24) is just $30, but the difference between XMS3 and Vengeance (8-8-8-24) is $80. My budget can go up to the Vengeance at 9-9-9, but the 8-8-8 is a bit to expensive for me.

But if I'm not going to overclock the RAMs, will the XMS3 work fine or do you still recommend the Vengeance for any other reason?

Thanks for your answers

Edit: If i buy memories with 9-9-9 latency, can't I just lower them to 8-8-8 or maybe even 7-7-7?
Edited by flaxe - 1/29/11 at 1:29pm
post #8 of 10
Quote:
Originally Posted by matroska View Post
Between those 2 i would go with the Vengeance kit.
Where did you read about the mems voltage with sandy bridge? Memory voltage has nothing to do with CPU, it is related to wether your board can handle that stick, @that speed, @that voltage.
Keep in mind the memory controller is built into the CPU with Sandy Bridge.

The Sandy Bridge CPU is rated at max 1.56V.
I have found that if I leave my memory voltage on Auto, while playing to get a stable overclock, my ASUS P67 Pro will sometimes push the DRAM voltage to 1.65V... And I have 1.5V ram.

Everytime it does that, Windows fails to load, and hangs on the loading screen. The only setting I have to change, is the DRAM voltage, and windows will successfully boot. So somehow, memory voltage DOES affect Sandy, although most good 1.65V DRAMS will run perfectly fine at 1.5.
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post #9 of 10
go to this page http://usa.asus.com/product.aspx?P_I...2YL&templete=2
go under memory support list. download the file and it gives you the list of every compatible RAM with a p67 PRO

If price is an issue I would just go with the XMS3. If you plan to overclock like you mentioned I will be worth the 30$ to get the heatsinks with the vengeance.
Yes you can change the timings with the RAM but there is no guarantee that changing the timings will work and / or be stable.

I currently have 1.6v RAM ( running at 1.6v ) with my p67 pro i5 setup and have had ZERO issues so far.
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post #10 of 10
Quote:
Originally Posted by flaxe View Post
I want 8GB (2x4) and I'm unsure if I can use a 1.65V memory together with SB or if I should buy a 1.5V memory just to be safe, and what speed (1333MHz or 1600MHz).
Is there a big difference between 1333Mhz and 1600MHz or won't I notice the difference?

Thanks, sorry for my English
Check out this article from Tom's Hardware:
http://www.tomshardware.com/reviews/...7,2325-11.html
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