MBP 8,2 Ram Upgrade Compatibility

I have a 2,2 Quad-Core 4 GB MBP 8,2. I think it is early 2011.
I have a freezing issue sometimes. I have an RAM optimizer app. And it sometimes hits to 100 mb free memory left.
Is every slot supports up to 8 GB?
How will it performance if I combine 8 GB and one of my 2 GB RAM's in total of 10 GB's.
Should I buy 2x4GB's instead for the best performance.
Thanks for the answers.

Hey Kappy. Me again. Luckily () it just crashed. So here is the latest posts.
9/8/12 12:21:32.254 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 12:22:16.114 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 12:22:17.115 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 12:22:46.513 AM lsboxd[2276]: @AE relay 4755524c:4755524c
9/8/12 12:22:50.291 AM Safari[237]: CGContextClipToRect: invalid context 0x0
9/8/12 12:22:52.249 AM Safari[237]: CGContextClipToRect: invalid context 0x0
9/8/12 12:22:54.664 AM Safari[237]: CGContextClipToRect: invalid context 0x0
9/8/12 12:40:07.429 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 12:40:08.431 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 12:40:09.238 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 12:40:10.239 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 12:40:17.832 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 12:40:18.833 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 12:46:21.653 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 12:46:22.481 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 12:46:22.654 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 12:46:23.482 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 12:46:25.098 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 12:46:26.100 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 12:51:12.192 AM Safari[237]: CGContextClipToRect: invalid context 0x0
9/8/12 12:51:25.717 AM Safari[237]: CGContextClipToRect: invalid context 0x0
9/8/12 12:51:53.598 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 12:51:53.983 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 12:51:54.599 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 12:51:54.984 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 12:51:55.399 AM Safari[237]: CGContextClipToRect: invalid context 0x0
9/8/12 12:52:55.182 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 12:52:55.849 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 12:52:56.183 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 12:52:56.849 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 12:55:58.000 AM kernel[0]: CODE SIGNING: cs_invalid_page(0x1000): p=3748[GoogleSoftwareUp] clearing CS_VALID
9/8/12 1:07:16.000 AM kernel[0]: nspace-handler-set-snapshot-time: 1347055638
9/8/12 1:09:02.398 AM Safari[237]: CGContextClipToRect: invalid context 0x0
9/8/12 1:09:14.503 AM Safari[237]: CGContextClipToRect: invalid context 0x0
9/8/12 1:09:18.682 AM Safari[237]: CGContextClipToRect: invalid context 0x0
9/8/12 1:09:21.011 AM Safari[237]: CGContextClipToRect: invalid context 0x0
9/8/12 1:09:23.504 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 1:09:24.505 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 1:09:24.854 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 1:09:25.854 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 1:10:24.445 AM WebProcess[2417]: *** WARNING: -[NSImage dissolveToPoint:fraction:] is deprecated in MacOSX 10.8 and later. Please use -[NSImage drawAtPoint:fromRect:operation:fraction:] instead.
9/8/12 1:10:24.446 AM WebProcess[2417]: *** WARNING: -[NSImage dissolveToPoint:fromRect:fraction:] is deprecated in MacOSX 10.8 and later. Please use -[NSImage drawAtPoint:fromRect:operation:fraction:] instead.
9/8/12 1:10:24.455 AM WebProcess[2417]: *** WARNING: -[NSImage compositeToPoint:operation:] is deprecated in MacOSX 10.8 and later. Please use -[NSImage drawAtPoint:fromRect:operation:fraction:] instead.
9/8/12 1:10:24.455 AM WebProcess[2417]: *** WARNING: -[NSImage compositeToPoint:fromRect:operation:] is deprecated in MacOSX 10.8 and later. Please use -[NSImage drawAtPoint:fromRect:operation:fraction:] instead.
9/8/12 1:11:48.234 AM login[3644]: DEAD_PROCESS: 3644 ttys000
9/8/12 1:12:59.564 AM Safari[237]: CGContextClipToRect: invalid context 0x0
9/8/12 1:13:11.071 AM Safari[237]: CGContextClipToRect: invalid context 0x0
9/8/12 1:14:11.080 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 1:14:11.739 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 1:14:12.082 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 1:14:12.741 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 1:14:17.544 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 1:14:18.544 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 1:16:22.683 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 1:16:23.684 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 1:18:13.972 AM login[3774]: USER_PROCESS: 3774 ttys000
9/8/12 1:20:40.026 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 1:20:41.027 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 1:20:44.450 AM WindowServer[77]: CGXSetWindowListAlpha: Invalid window 0
9/8/12 1:20:45.450 AM Dock[153]: CGSReleaseWindowList: called with 9 invalid window(s)
9/8/12 1:23:05.813 AM login[3774]: DEAD_PROCESS: 3774 ttys000
9/8/12 1:29:28.000 AM bootlog[0]: BOOT_TIME 1347056968 0

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