MacBook Black 2008' RAM support

I recently purchased an 8gb DDR2 800MHz ram kit and installed it into my Black MacBook which supports up to 6gb. I have TechTool's Pro 7 and it's giving me a "caution" symbol because the 800MHz RAM isn't the offical supported speed that the MacBook can take. Is it ok to have 2gb 667MHz RAM and a 4gb 800MHz RAM chip together? Does this cause system issues or slowdowns?
I am just weary because I noticed a slight lag after upgrading and I have a 128gb SSD inside and now 6gb of RAM which should theoretically speed things up even more.
Any help or insight would be fantastic! Thanks in advance

The biggest thing that is going to happen is the computer is going to only go as the slowest piece of RAM. I'm not sure what speed is supported by the computer and what one you should use, but I can tell you that by using a 667 MHz and an 800 MHz piece of RAM, the 800 MHz RAM is going to slow down and run at 667 MHz. If your computer can support the 800 MHz, then by having two of the same pieces of RAM in the computer, you are going to run at 800 MHz which in turn is going to be faster RAM which is going to get rid of the sluggish feeling that you were explaining. However, like I said, I'm not sure if it will accept the 800 MHz RAM if it doesn't support it. The only reason it is now if it doesn't is because the 667 MHz RAM that is there, is causing the other stick to slow down which is making it work with the computer even though it is 800 MHz. However, with the RAM being forced to slow down like that, it can cause some timing errors which is going to give you kernel panics and things like that so I would keep an eye on it.

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Andrew

I tried running from 1GB + 1GB, and it ran fine for a few hours, but upon waking from sleep I got the dreaded 3 beeps. This absolutely never happens otherwise, so I know where the problem lies now. The machine is back onto a single 2GB stick and running fine.
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And remember that in this case, it doesn't work with an older module either. 1GB + 2GB crashes. It eventually crashes if I have both slots occupied.

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