from System Profiler
Model Name: MacBook
Model Identifier: MacBook3,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 4 GB
Bus Speed: 800 MHz
Boot ROM Version: MB31.008E.B02
SMC Version (system): 1.24f3
this model supports up to "Lion" (10.7)
links
MacBook (13-inch, Late 2007) - Technical Specifications [from Apple]
13" MacBook Core 2 (Late 2007) [from lowendmac.com; sometimes I feel like getting a LEM t-shirt]
MacBook "Core 2 Duo" 2.0 13" (White-SR) Specs (Late 2007, MB061LL/B, MacBook3,1, A1181, 2200 [from everymac.com]