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Windows 7: Question about mixing RAM

07 Aug 2010   #11
Wishmaster

Windows 7 Home Premium 64bit
 
 

Well, not all RAM can OC as well as others.
RAM is also much easier to kill OCing it than, say the CPU.
As with any hardware, when it comes to OCing, you can't expect the same results as others even if it the same identical part.

Having said that, the faster RAm will happily run at a lower speed. possibly even slightly tighter timings.

So if you were to get 1800mhz RAM, the sticks themselves are guarnteed to runn at that speed/timings.

Even though your MOBO may or may not run all the DIMM slots populated at that speed.

You can still run them at a slower speed, (IE 1600) and have alot more OC headroom for the rest of the system.

If you plan on OCing, IMHO youd be better off getting the faster RAm, setting it slower and start OCing. As opposed to getting just what you need and hope it will make it to your goal.

Bottom line, dont expect huge OCing results from the RAm, and dont try to push it to hard.


My System SpecsSystem Spec
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07 Aug 2010   #12
okami 11x

Win7 Pro - 64bit
 
 

Alright thanks to both of you!! I'm just a little thickheaded so I have to drill it into my head a couple times.

The way I understand it is that it's best to buy the exact same brand/model as what you have for best performance. If I'm upgrading with a stick of the 4gb ripjaw I linked A) it might work better if I didn't use the 2gb stick with it since it's not the same model and B) I will not be able to dual channel those two stick together since they aren't the same size.

My OC questions stem from my mobo specs on Newegg.
Quote:
Memory Standard :: DDR3 1800 (OC)/1333/ 1066/ 800
I just don't understand why the 1800 has "(OC)" by it.

I don't really plan on OCing RAM since I don't understand it at all and I don't want to ruin anything.
My System SpecsSystem Spec
07 Aug 2010   #13
Wishmaster

Windows 7 Home Premium 64bit
 
 

Memory Standard :: DDR3 1800 (OC)/1333/ 1066/ 800

This means that officially the board supports up DDR3 1333.

But, it can handle up 1800mhz (although perhaps not with all the DIMMS full)

So if you plan on populating all the DIMM slots, you may need to go with DDR3 1333.

With just half the slots full, you should be able to run 1600 or 1800 RAM.

But keep in mind, this is a MOBO limitation.
So if you had 1600 RAM, and it can not run at those speeds with all slots full, you can simply set it to run at 1333.

All I meant in my prev. post is that, downclocking (or running slower than advertised) will always work. Making it run faster, not so much.

If you do not plan on any OCing just go with 1333 or 1600.
My System SpecsSystem Spec
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07 Aug 2010   #14
okami 11x

Win7 Pro - 64bit
 
 

Alright, thank you Wishmaster and Profdlp! I will have to ponder this one. Cuz I think eventually I want to populate all the DIMM slots (otherwise, why did I make sure to get a mobo with 4 slots?). I'll just have to research whether it's more beneficial to have 2 slots of 1800 memory or 4 slots of 1333.

I'm sorry if this is just another way of asking what I already asked but if I have two slots of 1800 dual channeled together, could I just populate the other two slots with 1333 dual channeled and not lose the speed of the 1800?
My System SpecsSystem Spec
07 Aug 2010   #15
Wishmaster

Windows 7 Home Premium 64bit
 
 

Quote   Quote: Originally Posted by okami 11x View Post
Alright, thank you Wishmaster and Profdlp! I will have to ponder this one. Cuz I think eventually I want to populate all the DIMM slots (otherwise, why did I make sure to get a mobo with 4 slots?). I'll just have to research whether it's more beneficial to have 2 slots of 1800 memory or 4 slots of 1333.

I'm sorry if this is just another way of asking what I already asked but if I have two slots of 1800 dual channeled together, could I just populate the other two slots with 1333 dual channeled and not lose the speed of the 1800?
You would be best populating the other 2 with the exact same kind as the first 2.
Worse case scenario, youll need to run it slower.
My System SpecsSystem Spec
07 Aug 2010   #16
okami 11x

Win7 Pro - 64bit
 
 

Quote   Quote: Originally Posted by Wishmaster View Post
You would be best populating the other 2 with the exact same kind as the first 2.
Worse case scenario, youll need to run it slower.
alright thanks!

I think I got everything answered lol
My System SpecsSystem Spec
07 Aug 2010   #17
profdlp

Main - Windows 7 Pro SP1 64-Bit; 2nd - Windows Server 2008 R2
 
 

Quote   Quote: Originally Posted by okami 11x View Post
...I just don't understand why the 1800 has "(OC)" by it...
The specification for that socket calls for a max of 1600 for the RAM speed. They're just letting you know that their board will handle a slight overclock (OC) of the memory speed, assuming your RAM is fast enough to handle it.

Computers are put together out of a large number of parts mad by many different manufacturers. Just so they are all working on the same page the major companies get together and define a certain set of standards. This is done years in advance and allows all the different parties involved to design parts that will work well together during the same general time frame. For example, it wouldn't do any good to design a CPU with a 1000MHz Front Side Bus if there were no motherboards or memory sticks to support it.

Where this gets interesting is when manufacturers know that people are going to want to push their hardware beyond the specification. I have a Core i7 system with a locked multiplier on the CPU. (I couldn't afford to spring $1,000 for the unlocked CPU... )

The only way I can go beyond the 2.67GHz my Core i7 920 CPU can handle is to boost the system bus. (Yeah, I know - Core i7 does this sort of "differently".) My CPU runs at a multiplier of 20X at a system speed of 133MHz. 20 X 133MHz = 2667MHz, or 2.67GHz.

I can crank up that 133MHz number fairly easily because I have memory rated at 1800MHz, not just the 1600MHz called for in the specification. (Memory has an added multiplier involved, which is due to the DDR - Double Data Rate - way they measure its speed.)

1800 is 1/8 faster than 1600 (200/1600 = 1/8). This all boils down to being able to boost my system speed by 1/8 without having the RAM limit me.
My System SpecsSystem Spec
07 Aug 2010   #18
okami 11x

Win7 Pro - 64bit
 
 

so I'm getting a little confused here...

Quote:
The specification for that socket calls for a max of 1600 for the RAM speed.
Does that mean that I cannot use 1800 mem in my motherboard? I would have to use 1600 then OC to 1800 correct? Even though it's not listed on Newegg, can I use 1600 in my build? or is 1333 the best I can get?

I do understand, though, that you're saying that OCing the mem from 1600 to 1800 boosts your speed of your computer. I'm just trying to figure out what my mobo can handle and I don't know how to go about that.
My System SpecsSystem Spec
07 Aug 2010   #19
profdlp

Main - Windows 7 Pro SP1 64-Bit; 2nd - Windows Server 2008 R2
 
 

Quote   Quote: Originally Posted by okami 11x View Post
...Does that mean that I cannot use 1800 mem in my motherboard? I would have to use 1600 then OC to 1800 correct?
If you run 1800 rated memory at 1800 then the memory is not being overclocked.

Quote:
Even though it's not listed on Newegg, can I use 1600 in my build? or is 1333 the best I can get?.
Get anything up to 1800 and you are fine. Get less than 1800 and it will work, just probably not faster than what it's rated for. (i.e., 1600 will run at 1600, 1333 will run at 1333.)
My System SpecsSystem Spec
07 Aug 2010   #20
okami 11x

Win7 Pro - 64bit
 
 

ahh ok...so even though it says 1800 (OC) it really just means that I can use up to 1800

makes sense and thanks for sticking through all my thickheadedness lol
My System SpecsSystem Spec
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