Downclocking RAM on MacBook White Unibody Mid 2010 model

[sjb411]

Hello. I recently bought 2 4GB RAM @ 1333mhz. The thing is, since Mac OS X does not have BIOS, it does not change the RAM's clock speed to its required speed. When i mix the ram, however, with one of my previous 1GB RAM, it works as 5GB. I have bootcamp and tried using Thaiphoon but it seems like you can only write the SPD with registered version. :\ any help?
The RAM brand is Micron, btw.

 

[Intell]

Why do you want to downclock your RAM?

 

[iThinkergoiMac]

Just purchase the correct RAM for your Mac. You can't hack the RAM to downclock, the ability to do so is built-in to the RAM itself.

Why do you want to downclock your RAM?

Because the Mac won't boot with 2 modules of incorrect speed installed. If it can't find at least one module of the correct speed, it will refuse to boot. Odd thing is, it'll use the module with the wrong speed just fine if the other module is the correct speed.

 

[sjb411]

Well

I did explain in the thread didn't i? it's very hard to get 4gb so-dimm 1066mhz in malaysia. There are a couple of tutorials out there but since i can't get thaiphoon to write over the SPD and SPDTool doesn't detect my RAMs, I thought I'd ask here.

 

[jav6454]

You don't need to under clock it. Just put in the slower clock sticks in their and your system will slow down to that speed. Thats the beauty of RAM clocks.

 

[sjb411]

Yeah, but I want to downclock one of my newly-bought RAM so I can use both of them. That's the whole point of buying two, right?

Edit: Well. I do have windows so isnt there a free application to edit the ram clock so i can run both of it?

 

[sjb411]

So does anyone know how to?

 

[iThinkergoiMac]

I did explain in the thread didn't i?

Actually, you didn't. I know about the problem, so I knew what you were talking about, but in your original post you never said your Mac wouldn't boot if it had both sticks. You just said

The thing is, since Mac OS X does not have BIOS, it does not change the RAM's clock speed to its required speed. When i mix the ram, however, with one of my previous 1GB RAM, it works as 5GB.

You implied that there was some sort of issue with it, but never said what the issue was. Thus, Intell's question.

Unfortunately, I don't have any advice about getting the correct speed RAM to Malaysia. Do the big guys like Crucial and NewEgg not ship there?