Reply 40 of 47, by Kahenraz
I ran some tests with Quake 1 on a fast Pentium D 3.4Ghz, to rule out any CPU bottlenecks. There was some kind of incompatibility with the GeForce FX series cards (PCI/PCIe), but performance was consistent when tested with a Voodoo 4 4500 PCI and a Radeon X300 PCIe.
The test results were as follows:
66 Mhz - 29.9, 30.8
75 Mhz - 32.6, 33.6
80 Mhz - 35.9, 36.0
90 Mhz - 39.3, 39.6
These tests were run at 640x480x16. Performance was consistently higher than with 32bit.
Performance seems to be pretty linear with clock speed for this test. This is very promising. I don't have any faster clock crystals to test with beyond 90 Mhz.
I didn't experience any graphical corruption or anomalies at any clock speed.