lol延遲問題有人可以給點建議嗎？

最近打lol畫面嚴重延遲5分鐘以上fps調整後可以達到60 ping大在在18左右
是該換顯卡媽還是神問題？有人能幫我解答媽？
Time of this report: 3/3/2015, 14:38:48
Machine name: WIN7-PC
Operating System: Windows 7 旗艦版 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_rtm.101119-1850)
Language: Chinese (Traditional) (Regional Setting: Chinese (Traditional))
System Manufacturer: To Be Filled By O.E.M.
System Model: To Be Filled By O.E.M.
BIOS: BIOS Date: 11/10/12 13:50:04 Ver: 08.00.15
Processor: Intel(R) Xeon(R) CPU X5460 @ 3.16GHz (4 CPUs), ~3.2GHz
Memory: 8192MB RAM
Available OS Memory: 8192MB RAM
Page File: 3245MB used, 13135MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode
Card name: ATI Radeon HD 4600 Series