I'm also using a venerable XPS 420 (Q6600, 120MB SSD, 4GB DDR2 667MHz Ram, ASUS GTX550Ti, + various HDD's) and upgrade the OS from Vista Home Premium 32Bit to Windows 8.1 Pro 64 Bit. The SSD and OS upgrade made a huge difference. No possibility to upgrade the BIOS as DELL's motherboard is...