If your FSB is 333 (1333 QDR) then you want memory clocked at 333 or higher (667 DDR).
DIMM1 = 333 MHz, DDR2, 64 bits wide
DIMM2 = 333 MHz, DDR2, 64 bits wide
MCH (NorthBridge / Memory Controller Hub) links them in Dual-Channel (128 bits wide, for 10.67 GB/sec peak throughput).
MCH talks to FSB on a 333 MHz, QDR FSB, 64 bits wide, which is also 10.67 GB/sec peak throughput just the bus to the CPU from MCH is half as wide (vs MCH to RAM).
However a setting of 266 MHz in your "Intel mainboard" BIOS may actually mean 1:1 ratio with 266 FSB, and as you've changed FSB to 333 to overclock, your RAM may actually be running at 333 (667 DDR).
If this is the case setting it to 333 will lead to your memory trying to run at 833.333 MHz DDR (416.667 MHz base clock, which is likely out of spec and may cause problems).
However (2), if this is not the case then you want to use 333/333. But I strongly suspect in the Intel BIOS that every value you see is assuming there is not overclock in place (a pre-overclock value) - I could be wrong though.
:? - Confusing, eh ?
Try the memory throughput benchmark in SiSoft SANDRA 2007.
http://www.sisoftware.co.uk
At least then we can compare scores.
RAM: INT: 5247 / FLOAT: 5270 - both in MB/sec
Use Large Memory Pages was off (this reduces the score, so to compare we both need to confirm it is not flagged)
This is while running browsers, iTunes with music, etc with 2 x G.Skill DDR2-800 (4-4-4-12, 2.05 Volts) running at DDR2-667 with 5-5-5-14 (or 15) timings though.
FSB is: 333 MHz base (1333 QDR).
The large prefetching of Core 2 Duo hurts its results in this test btw, but it does score high on efficiency. 8)
Least using SANDRA Mainboard Info and Memory Throughput test you'll be able to see what is going on under the hood.
eg: (Copy the below into Notepad or WordPad, OpenOffice, etc, or just bump the fonts up heaps to read on) - 8)
SiSoftware Sandra
Mainboard
Manufacturer : Gigabyte Technology Co., Ltd.
MP Support : 1 Processor(s)
MPS Version : 1.40
Model : 965P-DQ6
System BIOS : 09/20/2006-P965-ICH8-6A79LG0GC-00
System Memory Controller
Location : Mainboard
Error Correction Capability : None
Number of Memory Slots : 4
Maximum Installable Memory : 4GB
Bank0/1 - A0 : DIMM 1GB/64 @ 66Mt/s
Bank2/3 - A1 : Empty
Bank4/5 - A2 : DIMM 1GB/64 @ 66Mt/s
Bank6/7 - A3 : Empty
Chipset 1
Model : Giga-Byte Technology ??? (29A0)
Bus(es) : PCI PCIe IMB USB FireWire/1394 i2c/SMBus
Front Side Bus Speed : 4x 334MHz (1336MHz data rate)
Maximum FSB Speed / Max Memory Speed : 4x 400MHz / 4x 233MHz
Width : 64-bit
IO Queue Depth : 12 request(s)
Chipset 1 Hub Interface
Type : DMI (Direct Media Interface)
Version : 1.00
Number of Ports : 4
In/Out Width : 4-bit / 4-bit
Multiplier : 3/1x
Speed : 8x 2500MHz (20000MHz data rate)
Logical/Chipset 1 Memory Banks
Speed : 4x 167MHz (668MHz data rate)
Multiplier : 4/8x
Width : 64-bit
Memory Controller in Processor : No
Performance Acceleration Technology : Yes
Refresh Rate : 7.80µs
Power Save Mode : No
Fixed Hole Present : No
APIC 1
Version : 2.00
Multiplier : 1/2x
Maximum Interrupts : 24
IRQ Handler Engaged : Yes
Enhanced Support : Yes
Memory Module 1
Model : F2-6400PHU1-1GBHZ
Type : 1GB DIMM DDR2-SDRAM
Technology : 16x(64Mx8)
Speed : PC2-6400U
Standard Timings : 5.0-5-5-14 (tCL-tRCD-tRP-tRAS)
Version : 1.2
Date of Manufacture : Saturday, 25 December 1999
Set Timing @ 400MHz : 5.0-5-5-14 (tCL-tRCD-tRP-tRAS)
Set Timing @ 267MHz : 4.0-3-3-10 (tCL-tRCD-tRP-tRAS)
Memory Module 2
Model : F2-6400PHU1-1GBHZ
Type : 1GB DIMM DDR2-SDRAM
Technology : 16x(64Mx8)
Speed : PC2-6400U
Standard Timings : 5.0-5-5-14 (tCL-tRCD-tRP-tRAS)
Version : 1.2
Date of Manufacture : Saturday, 25 December 1999
Set Timing @ 400MHz : 5.0-5-5-14 (tCL-tRCD-tRP-tRAS)
Set Timing @ 267MHz : 4.0-3-3-10 (tCL-tRCD-tRP-tRAS)
PCI Bus(es) on Hub 1
Version : 2.30
Number of Bridges : 5
PCI Bus 0 : PCI (1/1x PCIClk)
PCI Bus 1 : PCIe (3/1x PCIClk)
PCI Bus 2 : PCIe (3/1x PCIClk)
PCI Bus 3 : PCIe (3/1x PCIClk)
PCI Bus 4 : PCIe (3/1x PCIClk)
PCI Bus 5 : PCI (1/1x PCIClk)
Number of PCIe Lanes : 19
LPC Hub Controller 1
Model : Giga-Byte Technology ??? (2810)
ACPI Power Management Enabled : Yes
Advanced TCO Mode Support : Yes
Advanced TCO Mode Enabled : No
High Precision Timer Support : Yes
High Precision Timer Enabled : No
Delayed Transaction Enabled : Yes
LPC Hub Controller 2
Model : Giga-Byte Technology ??? (283E)
USB Controller 1
Model : Giga-Byte Technology ??? (2834)
Version : 1.10
Interface : UHCI
Channels : 2
Speed : 48MHz
Supported Speed(s) : Low (1.5Mbps) Full (12Mbps)
Legacy Emulation Enabled : No
USB Controller 2
Model : Giga-Byte Technology ??? (2835)
Version : 1.10
Interface : UHCI
Channels : 2
Speed : 48MHz
Supported Speed(s) : Low (1.5Mbps) Full (12Mbps)
Legacy Emulation Enabled : No
USB Controller 3
Model : Giga-Byte Technology ??? (283A)
Version : 2.00
Specification : 1.00
Interface : EHCI
Channels : 4
Companion Controllers : 2
Supported Speed(s) : Low (1.5Mbps) Full (12Mbps) High (480Mbps)
Addressing Support : 64-bit
Legacy Emulation Enabled : No
USB Controller 4
Model : Giga-Byte Technology ??? (2830)
Version : 1.10
Interface : UHCI
Channels : 2
Speed : 48MHz
Supported Speed(s) : Low (1.5Mbps) Full (12Mbps)
Legacy Emulation Enabled : No
USB Controller 5
Model : Giga-Byte Technology ??? (2831)
Version : 1.10
Interface : UHCI
Channels : 2
Speed : 48MHz
Supported Speed(s) : Low (1.5Mbps) Full (12Mbps)
Legacy Emulation Enabled : No
USB Controller 6
Model : Giga-Byte Technology ??? (2832)
Version : 1.10
Interface : UHCI
Channels : 2
Speed : 48MHz
Supported Speed(s) : Low (1.5Mbps) Full (12Mbps)
Legacy Emulation Enabled : No
USB Controller 7
Model : Giga-Byte Technology ??? (2836)
Version : 2.00
Specification : 1.00
Interface : EHCI
Channels : 6
Companion Controllers : 3
Supported Speed(s) : Low (1.5Mbps) Full (12Mbps) High (480Mbps)
Addressing Support : 64-bit
Legacy Emulation Enabled : No
FireWire/1394 Controller 1
Model : Giga-Byte Technology TSB43AB23 1394a-2000 OHCI PHY/link-layer Controller
Version : 1.10
Interface : OHCI
Enhanced Support : Yes
Channels : 64
Speed : 400MHz
System SMBus Controller 1
Model : Intel 801xx/63xx SMBus
Version : 0.02
Specification : 2.00
Advanced TCO Mode Enabled : No
Slave Device Enabled : Yes
PEC Support : Yes
Speed : 100kHz
Expansion Slot(s)
PCI : PCI 32-bit +5V +3.3V PME i2c/SMBus Full-Length Used
PCI (1h) : PCI 32-bit +5V +3.3V PME i2c/SMBus Full-Length Available (Intel Corporation ??? (29A1))
PCI (6h) : PCI 32-bit +5V +3.3V PME i2c/SMBus Full-Length Used
PCI : PCI 32-bit +5V +3.3V PME i2c/SMBus Full-Length Used
Port Connector(s)
PRIMARY IDE : None - ATA / None
SECONDARY IDE : None - ATA / None
FDD : 8251 FIFO - Floppy Disk / None
COM1 : Serial Port 16450 - 9 Pin Dual Inline / DB-9 pin male
COM2 : Serial Port 16450 - 9 Pin Dual Inline / DB-9 pin male
LPT1 : Parallel Port ECP/EPP - DB-25 pin female / DB-25 pin female
Keyboard : Keyboard - None / PS/2
PS/2 Mouse - Detected : Mouse - PS/2 / PS/2
USB : USB - None / USB
USB : USB - None / USB
Performance Tips
Notice 224 : SMBIOS/DMI information may be inaccurate.
Tip 2511 : Some memory slots are free so the memory can be easily upgraded.
Tip 2 : Double-click tip or press Enter while a tip is selected for more information about the tip.