総合スレより
非公式なので動作保障はできませんがXGシリーズにも適用可能なので注目ですね。
X-Fiのドライバは噂以上に糞すぎた… つかPCI-EのTitaniumシリーズ入ってねぇ＼(^o^)／
価格的にXG買っとけば良かった気がしてならない。

PAX PCI XFI All-OS-Driver V1.55
ttp://www.tweakforce.com/modules.php?name=Forums&file=viewtopic&t=4678
Supported cards:
Sound Blaster X-Fi XtremeGamer Fatal1ty Professional Series
Sound Blaster X-Fi Platinum Fatal1ty Champion Series
Sound Blaster X-Fi XtremeMusic
Sound Blaster X-Fi XtremeGamer
Sound Blaster X-Fi Platinum
Sound Blaster X-Fi Fatal1ty
Sound Blaster X-Fi Elite Pro
Sound Blaster X-Fi
Soundblaster X-Fi OEM Cards: Dell, HP and Gateway
Setup should work with any XFI Card now!

Supported OS: XP, Vista, Win7 32 and 64Bit

Based on: AuzenTech HD Theater Driver set 2.20.0002.1

PAX Changes:
+ True HD Theater Sound! < Base on HD Theater Drivers.
+ Fix CMSS 3d from HD Theater driver set.
+ Fix 5.1 direct from HD Theater driver set.
+ Fix X64 Comp issue should work now.
+ Added more Tweaks.