Is 800 MHz RAM compatible with 667MHz?

The motherboard will run the RAM at 667MHz instead of 800MHz and everything will be fine. The disadvantage is that you lose a bit of performance from the lower frequency.

Can 1600Mhz RAM work on 800?

No you can’t. If you put two RAM sticks with two different speeds into the laptop, it will not switch on until you take one of them out.

Why is my RAM only running at 667MHz?

667mhz is half of 1333mhz, which means that your ram is running at 1333mhz, which is standard. Just go in your bios and change it to 1600mhz, then it will show you are running it at 800mhz, which is the correct speed.

Can I mix 667 and 800mhz RAM?

Yes, you can install both 800mhz & 667mhz RAM sticks, But it reduce the lifespan of Both RAM sticks.

What DDR2 800?

DDR2 SDRAM

Type of RAM
Front and back of a 2GB PC2-5300 DDR2 RAM module for desktop PCs (DIMM)
Release date 2003
Standards DDR2-400 (PC2-3200) DDR2-533 (PC2-4266) DDR2-667 (PC2-5333) DDR2-800 (PC2-6400) DDR2-1066 (PC2-8500)
Clock rate 100–266 MHz

What is the difference between 667MHz and 800MHz RAM?

It’s more or less a capability rating. The 800MHz RAM is rated to provide data to the CPU faster than the 667MHz. However they can both operate at 667MHz or lower or even higher, though if its higher than the RAM is rated for its considered to be overclocked.

Can I use 1066 and 1333 RAM together?

You can mix RAM of both speeds (1066/1333). The system will automatically use the slower speed, but there is no risk of system crashes.

Can I combine 1333 and 1600 RAM?

Yes, you can mix 1333 and 1600 MHz RAM sticks, however the system will downclock all RAM to the speed of the slowest stick. For best performance, try and buy RAM that is the same speed or faster.