To increase the clock speed of your CPU, you need to either look into overclocking (which is dangerous) or buying a new processor (which will cost anywhere from $40 to over $1000).
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That is completely dependant on which games you wish to play. Chances are you will need a faster processor to be able to play games such as Gears of war 2 which requires a minimum of 2.4 Ghz. Unreal tournament 3 - 2.8 Ghz, Bioshock - 2.4, C&C3 - 2.4. You can play Portal though: It only has 1.7 Ghz minimum requirement. basically your not going to be able to play much with a 1.8 Ghz processor and even if you do, the games you play will probably have to be set to the lowest graphics settings and will still lag like crazy.
Yes.
Maybe, it depends on the type of processor, other hardware and software.
Recommended System RequirementsOS - Windows XP / VistaProcessor - Intel Core 2 DUO @ 2.2GHz or AMD Athlon 64 X2 4400+Memory - 2.0 GB RAMGPU - NVIDIA GeForce 8800 GTS/640 or similarMinimum System RequirementsOS - Windows XP or Windows VistaProcessor - 2.8 GHz or faster (XP) or 3.2 GHz or faster* (Vista)Memory - 1.0 GB RAM (XP) or 1.5 GB RAM (Vista)Video Card -256 MB**Hard Drive - 12GBSound Card - DirectX 9.0c compatible* Supported Processors: Intel Pentium 4 2.8 GHz (3.2 GHz for Vista) or faster, Intel Core 2.0 GHz (2.2 GHz for Vista) or faster, AMD Athlon 2800+ (3200+ for Vista) or faster** Supported chipsets: NVIDIA GeForce 6800 GT or greater; ATI Radeon 9800 Pro (Radeon X800 Pro for Vista) or greater. Laptop versions of these chipsets may work but are not supported. Integrated chipsets are not supported. Updates to your video and sound card drivers may be required.
Yes it can. I've done it plenty of times (my computer uses a 1.8GHz dual-core). I've played UT2004 and Need for Speed Most Wanted fine on it. Mind you, if your computer has a 1.6GHz processor, increase the RAM to the maximum supported, it really helps.