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reaching 1066 speed with two brands of RAM?


sterlinggold

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Hi all,

 

I have two Corsair CM2X2048-8500C5D DIMMs and two Crucial CT2KIT25664AA1067 DIMMs on an Asus P5Q Pro mobo. BIOS RAM settings are all in auto.

 

When I plug only one brand in the BIOS splash screen shows RAM speed as 1066. But when I mix the brands the BIOS splash shows 800.

 

is there any way for me to reach full 1066 with all 4 DIMMs connected?

 

Thanks

 

 

CPUZ output

 

Chipset

-------------------------------------------------------------------------

 

Northbridge Intel P45/P43/G45/G43 rev. A3

Southbridge Intel 82801JR (ICH10R) rev. 00

Graphic Interface PCI-Express

PCI-E Link Width x16

PCI-E Max Link Width x16

Memory Type DDR2

Memory Size 8192 MBytes

Channels Dual, (Symmetric)

Memory Frequency 400.0 MHz (1:1)

CAS# latency (CL) 5.0

RAS# to CAS# delay (tRCD) 5

RAS# Precharge (tRP) 5

Cycle Time (tRAS) 15

Row Refresh Cycle Time (tRFC) 44

Command Rate (CR) 2T

MCHBAR I/O Base address 0x0FED14000

MCHBAR I/O Size 4096

 

 

Memory SPD

-------------------------------------------------------------------------

 

DIMM # 1

SMBus address 0x50

Memory type DDR2

Module format Regular UDIMM

Manufacturer (ID) Crucial Technology (7F7F7F7F7F9B0000)

Size 2048 MBytes

Max bandwidth PC2-8900 (555 MHz)

Part number

Serial number FFFFFFFF

Manufacturing date Week 165/Year 165

Number of banks 2

Data width 64 bits

Correction None

Nominal Voltage 1.80 Volts

EPP no

XMP no

JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency

JEDEC #1 5.0-5-5-15-20 @ 333 MHz

JEDEC #2 6.0-6-6-18-24 @ 400 MHz

JEDEC #3 7.0-8-8-25-33 @ 555 MHz

 

DIMM # 2

SMBus address 0x51

Memory type DDR2

Module format Regular UDIMM

Manufacturer (ID) Corsair (7F7F9E0000000000)

Size 2048 MBytes

Max bandwidth PC2-6400 (400 MHz)

Part number CM2X2048-8500C5D

Number of banks 2

Data width 64 bits

Correction None

Nominal Voltage 1.80 Volts

EPP yes (1 profiles)

XMP no

JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency

JEDEC #1 4.0-4-4-13-16 @ 270 MHz

JEDEC #2 5.0-5-5-18-23 @ 400 MHz

EPP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)

EPP profile #1 (full) 5.0-5-5-15-22-2T @ 533 MHz (2.100 Volts)

 

DIMM # 3

SMBus address 0x52

Memory type DDR2

Module format Regular UDIMM

Manufacturer (ID) Crucial Technology (7F7F7F7F7F9B0000)

Size 2048 MBytes

Max bandwidth PC2-8900 (555 MHz)

Part number

Serial number FFFFFFFF

Manufacturing date Week 165/Year 165

Number of banks 2

Data width 64 bits

Correction None

Nominal Voltage 1.80 Volts

EPP no

XMP no

JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency

JEDEC #1 5.0-5-5-15-20 @ 333 MHz

JEDEC #2 6.0-6-6-18-24 @ 400 MHz

JEDEC #3 7.0-8-8-25-33 @ 555 MHz

 

DIMM # 4

SMBus address 0x53

Memory type DDR2

Module format Regular UDIMM

Manufacturer (ID) Corsair (7F7F9E0000000000)

Size 2048 MBytes

Max bandwidth PC2-6400 (400 MHz)

Part number CM2X2048-8500C5D

Number of banks 2

Data width 64 bits

Correction None

Nominal Voltage 1.80 Volts

EPP yes (1 profiles)

XMP no

JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency

JEDEC #1 4.0-4-4-13-16 @ 270 MHz

JEDEC #2 5.0-5-5-18-23 @ 400 MHz

EPP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)

EPP profile #1 (full) 5.0-5-5-15-22-2T @ 533 MHz (2.100 Volts)

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