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PCIe was first released in 2004 and started to dominate by 2006. I think the last AGP card I owned was the ATi Radeon 9800 Pro 128MB. Great card at the time. That was in an Athlon XP system. ...

Nice. You should be pleased with the CPU upgrade, especially under Linux. The quad cores make a big difference for multitasking especially.

For GPU's, since your original question they have...

As Kin said, depends what you want to do with it. looking at your specs you could improve the performance by upgrading the cpu with a second hand one compatible with your motherboard, and also...