How do I determine what Ram my macbook would need, it seems to max out at 4GB, but only has 2GB right now...

Question

Processor
Memory
Processor speed:
- 2.1 GHz
Processor Type:
- Intel, Core 2 Duo (Penryn)
Number of Cores:
- 2
Bus Speed:
- 800 MHz
Cache:
- 3 MB L2 cache
64-bit Support:
- Yes
Turbo Boost:
- No
Installed RAM:
- CTO
Max. Amount:
- 4.0 GB
Amount of Slots:
- 2
RAM Speed:
- 667 MHz
RAM Type:
- PC2-5300, DDR2, SO-DIMM.

Answer 1

First we need to know which one of the 9 different models of MacBook you have. To see which model you have go to the Apple in the upper left corner and select About This Mac, then click on More Info . When System Profiler comes up check the Model Identifier and post it back here.
The model 1,1 (Early 2006) can use 2gb of 200 pin 667mhz PC2-5300 RAM
The model 2,1 (Late 2006 & Mid 2007) can use 3gb of 200 pin 667mhz PC2-5300 RAM
The model 3,1 (Late 2007) can use 6gb of 200 pin 667mhz PC2-5300 RAM
The model 4,1 (Early 2008) can use 6gb of 200 pin 667mhz PC2-5300 RAM
The model 5,2 (Early 2009, 2.0GHz Model Only) can use 6gb of 200 pin 667mhz PC2-5300 RAM