Monitors generally come in frequencies of 49 MHz, 900 MHz, and even 2.4 GHz.
Buy your PC with at least a Pentium III, IV or AMD Athlon processor in the 1.5 GHz category.
Sure, range might increase slightly, but sometimes you can get more distance from a 900 Mhz phone than a 2.4 Ghz cordless phone.
When you read a Core 2 processes at 2.0 GHz, that doesn't mean since you have two processors, you have 4.0 GHz of speed.
As of this writing, new computers typically have processor speeds ranging from 1 Ghz to 3 Ghz right out of the box.