he PC version of GTA 4 has CPU power for breakfast - independent on clock speed, L2 cache or number of cores. The latter ones are very important, because without quad-core power GTA 4 is noticeably less enjoyable. For example: A Q6600 is about 52 percent faster than the dual-core E6600 when both CPUs are running at 2.4 GHz. If the clock speed is increased, the difference gets smaller, but is still huge and a QX6850 is 47 percent faster than an E6850. Dual-core processors have a serious disadvantage and only with 3.6 GHz an E8500 is able to beat the Q6600, but GTA 4 nevertheless suffers from frequent lags on dual-core systems - no matter if an AMD or Intel CPU is used.