Glide is officially a dead api; 3dfx is not going down that road anymore in the future. Does UT play better under glide than d3d? Yes. But the new 4.20 patch came out yesterday so I haven't tried the d3d code yet.
I would return it; the geforce is a better all-around card than the v3.
Asus P9X79-Deluxe, Intel i7 3930k @ 4.2Ghz, 16gb DDR3-1600 Kingston HyperX Memory, Coolermaster Storm Trooper case, Corsair AX850 psu, EVGA GTX 1080, Corsair Model H100 w/c, Samsung 840 Pro 512gB SSD, Intel 750 pci-e x4 SSD 800gB, Asus Blu-ray Writer 12x, Dell P2715Q 27" Ultra HD 3840x2160 4K LED IPS Monitor, Windows10 Pro x64
MSI GS Series GS60 Ghost-003 Gaming Notebook 15.6", Intel Core i7-4700HQ 2.40GHz, 16GB Memory 1TB HDD 128GB SSD, NVIDIA GeForce GTX 860M 2GB, 4.36 lbs.