I need help with my bios settings

Ok CPU Clock Ratio [x15] at 3.01GHz I would like to get it a little higher
I have Windows Visa Ultimate 64-bit Service Pack 2 and it would restart my pc at random times but i just changed my ram Voltage from [Auto] to [+0.150] 1.950V and it has bin a LOT more stable but not 100% I would like some help setting up my bios to try to stabilize my pc
heres some of my pc's specs.

Thermaltake Toughpower 750W Main Features
Up to 750 Watts continuous output power
ATX 12V 2.2 and EPS 12V compliant
140mm cooling fan with auto fan speed control for quiet operation
Tight voltage regulation (±3%)
High efficiency (83%) and Active PFC
Quad +12V outputs (up to 60A)
info http://www.pcper.com/article.php?aid=266

Motherboard GA-MA790X-DS4 AMD 790X + SB600 Chipset
info http://www.gigabyte.com.tw/Support [...] uctID=2695

CPU AMD Athlon Dual-Core Kuma 7750 Black Edition Socket AM2+ (940)

ATI Radeon HD 4850 Over Clocked from HIS the Ice Q4 Turbo X 685MHz 2.2GHz Memory Clock
Idel Temp 43c Lode 56c to 58c fan speed set to 65%

OCZ Reaper HPC heat pipe conduit DDR2 800 4GB 2.2v
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Windows Visa Ultimate 64-bit Service Pack 2

Windows Experience Index 5.7

Processor - 5.7

Memory (RAM) 4.00 GB - 5.9

Graphics ATI Radeon HD 4800 Series - 5.9

Gaming graphics 2303 MB Total available graphics memory - 5.9

Primary hard disk 116GB Free (149GB Total) - 5.9
--------------------------------------------------------------
Bios Setting
CPU Clock Ratio [x15] it has [x15.5] [x16] [x16.5] [x17] >
CPU NorthBridge Freq [Auto] it has [x5] [x6] [x7] [x8] [x9] [x10] >
Memory Controller Volt [Auto] it has [-0.0125][-0.0250][-0.0375][-0.0500][-0.0625][-0.0750] >
CPU Host Clock Control [Auto] it has [Manual]

In Blue x CPU Frequency (MHz) 200

PCIE Clock (MHz) [100] >
HT Link Frequency [Auto] it has [200MHz][400MHz][600MHz][1GHz][1.2GHz][1.4GHz] >
Set Memory Clock [Manual] it has [Auto]
Memory Clock [x4.00] 800Mhz it has [5.33] 1066Mhz

In Blue x EPP Mode - Disabled
In Blue x EPP Voltage Control - Normal

DRAM COnfiguration [Press Enter]
******** System Voltage Optimized ********
System Voltage Control [Manual] it has [Auto]
CPU Voltage Control [Normal] it has [+0.025][+0.050][+0.075][+0.100][+0.125][+0.150] >

In Blue x CPU Vcore 1.325V

DDR2 Voltage Control [+0.150] In Blue 1.950V My OCZ Ram says it can go to 2.2V
NorthBridge Voltage Control [Normal] it has [+0.025][+0.050][+0.075][+0.100][+0.125][+0.150] >
SouthBridge Voltage Control [Normal] it has [+0.025][+0.050][+0.075][+0.100][+0.125][+0.150] >

BIOS PIC'S
http://picasaweb.google.com/lh/pho [...] directlink
http://picasaweb.google.com/lh/pho [...] directlink
http://picasaweb.google.com/lh/pho [...] directlink

Any help would be greatly appreciated.