What’s the specs of this “MacBook Regular” then? Not all of us care about apple products enough to know what they’re like.
Are you talking about the original Intel Core Duo 1.83 GHz or 2.0 GHz that has a intel GMA950 2006 launch intel Macbook ? or the core 2 duo Macbook that came out in late 2006 ?
now if it was the Macbook model with the Nvidia GeForce 9400M it would be somewhat safe to say yeah it will but a bit slow because it still uses Ram from system Ram.
Also pay attention to the system requirements
Minimum: OS X version Leopard 10.5.8, Snow Leopard 10.6.3, 1GB RAM, NVIDIA GeForce 8 or higher, ATI X1600 or higher, or Intel HD 3000 or higher Mouse, Keyboard, Internet Connection.
so it would be a safe guess that you might not be able to run Gmod if it has a intel GMA950 GPU, or even the Intel GMA X3100, it might run but chances are greater that it might not.
Nevermind I decided to get The iMac.
Oh you was talking about a New Mac. well you should have said so, yeah a new Macbook can run it, but the iMac will run it better. Macbook (GeForce 320m with shared ram and a C2D CPU) vs iMac (Radeon HD 6970M with dedicated ram and a quad-core Intel Core i5), yeah the iMac will blow it out of the water.