Asus P5b Deluxe with 8gb of DDR2 800mhz

HI, first please don't tell me, 'you should buy a new motherboard because the one you have is old'. I know that, but right now i don't have money to change it.

Ok, so the thing is that i have 4 2gb Kingston HyperX memory at 800mhz on my P5b Deluxe. So 8gb in total.

At first no problem, the motherboard recognize all 8gb with the Memory remap function 'on'

The problem is that it recognizes it has PC-5300 and not PC-6400 (as it should cause they are)


- So is there a way in the bios to make it that my motherboard recognize them has PC-6400 (800mhz) ?

Other thing, Even though i am sure i bought exactly the same memory, in the sandra report, the 2 pairs are different.

- Can someone explain me the difference?

Thanks in advance

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Here is the Sandra report:

Processor
Model : Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz
Speed : 3GHz
Cores per Processor : 2 Unit(s)
Type : Dual-Core
Integrated Data Cache : 2x 32kB, Synchronous, Write-Thru, 8-way, 64 byte line size
L2 Cache : 6MB, ECC, Synchronous, ATC, 24-way, 64 byte line size, 2 threads sharing

Computer
Mainboard : ASUS P5B-Deluxe
BIOS : AMI (OEM) 1238 09/30/2008
Bus(es) : ISA X-Bus PCI PCIe IMB USB FireWire/1394 i2c/SMBus
Multi-Processor (MP) Support : No
Multi-Processor Advanced PIC (APIC) : Yes
Total Memory : 8GB DIMM DDR2

Chipset
Model : ASUS P5B
Front Side Bus Speed : 4x 333MHz (1.33GHz)
Total Memory : 8GB DIMM DDR2
Channels : 2
Memory Bus Speed : 2x 333MHz (666MHz)

Memory Module(s)
Memory Module : Kingston 2GB DIMM DDR2 PC2-6400U DDR2-800 (5-6-6-18 3-24-6-3)
Memory Module : Kingston 2GB DIMM DDR2 PC2-6400U DDR2-800 (5-6-6-18 3-24-6-3)
Memory Module : Kingston 2G-UDIMM 2GB DIMM DDR2 PC2-6400U DDR2-800 (5-5-5-18 3-23-6-3)
Memory Module : Kingston 2G-UDIMM 2GB DIMM DDR2 PC2-6400U DDR2-800 (5-5-5-18 3-23-6-3)

Video System
Video Adapter : NVIDIA GeForce 7600 GT (12 PS3.0, 5 VS3.0 562MHz, 256MB DDR3 1.4GHz 128-bit, PCIe 1.00 x16)

Graphics Processor

Storage Devices
WDC WD4500HLHX-01JJPV0 (450GB, SATA600, 3.5", 10000rpm, 32MB Cache) : 419GB (C:)
Seagate ST31500341AS (1.5TB, SATA300, 3.5", 7200rpm) : 1TB (D:) (E:) (F:)
Seagate ST32000641AS (2TB, SATA600, 3.5", 7200rpm) : 2TB (G:) (H:)
TSSTcorpDVD-ROM SH-D163B (SATA150, DVD+-R, CD-R, 198kB Cache) : N/A (I:)
TSSTcorpCD/DVDW SH-S183L (SATA150, DVD+-RW, CD-RW, 2MB Cache) : N/A (J:)
ASUS DRW-1814BLT (SATA150, DVD+-RW, CD-RW, 2MB Cache) : N/A (K:)

Logical Storage Devices
Hard Disk (C:) : 202GB (NTFS) @ WDC WD4500HLHX-01JJPV0 (450GB, SATA600, 3.5", 10000rpm, 32MB Cache)
Docs (D:) : 31GB (NTFS) @ Seagate ST31500341AS (1.5TB, SATA300, 3.5", 7200rpm)
SoundProjec (G:) : 976GB (NTFS) @ Seagate ST32000641AS (2TB, SATA600, 3.5", 7200rpm)
Music (E:) : 147GB (NTFS) @ Seagate ST31500341AS (1.5TB, SATA300, 3.5", 7200rpm)
Entertain (F:) : 976GB (NTFS) @ Seagate ST31500341AS (1.5TB, SATA300, 3.5", 7200rpm)
SoundBank (H:) : 887GB (NTFS) @ Seagate ST32000641AS (2TB, SATA600, 3.5", 7200rpm)
3.5" 1.44MB (A:) : N/A
Optical Drive (I:) : N/A @ TSSTcorpDVD-ROM SH-D163B (SATA150, DVD+-R, CD-R, 198kB Cache)
Optical Drive (J:) : N/A @ TSSTcorpCD/DVDW SH-S183L (SATA150, DVD+-RW, CD-RW, 2MB Cache)
Optical Drive (K:) : N/A @ ASUS DRW-1814BLT (SATA150, DVD+-RW, CD-RW, 2MB Cache)

Peripherals
LPC Hub Controller 1 : ASUS P5B
LPC Legacy Controller 1 : Winbond W83627DHG
Audio Device : ASUS P5B
Audio Codec : Analog Devices AD1988B Sound Chip
Serial Port(s) : 1
Disk Controller : ASUS 82801H (ICH8) 4 port SATA Controller
Disk Controller : ASUS 82801H (ICH8) 2 port SATA Controller
Disk Controller : ASUS P5B [JMB363]
USB Controller 1 : ASUS P5B
USB Controller 2 : ASUS P5B
USB Controller 3 : ASUS P5B
USB Controller 4 : ASUS P5B
USB Controller 5 : ASUS P5B
USB Controller 6 : ASUS P5B
USB Controller 7 : ASUS P5B
FireWire/1394 Controller 1 : Avlab Technology XIO2200(A) IEEE-1394a-2000 Controller (PHY/Link)
FireWire/1394 Controller 2 : ASUS TSB43AB22 1394a-2000 OHCI PHY/Link-Layer Controller
SMBus/i2c Controller 1 : Intel ICH SMBus

Printers and Faxes
Printer : Nitro PDF Driver (600x600, Colour)
Printer : Microsoft XPS Document Writer (600x600, Colour)
Fax : Microsoft Shared Fax Driver (200x200)

Network Services
Network Adapter : Generic Marvell Yukon 88E8056 based Ethernet Controller (Ethernet, 100Mbps)
Network Adapter : Marvell Yukon 88E8001/8003/8010 PCI Gigabit Ethernet Controller (Ethernet)

Power Management
Mains (AC) Line Status : On-Line

Operating System
Windows System : Microsoft Windows 7 Ultimate 6.01.7601 (Service Pack 1)
Platform Compliance : x64

Memory Module(s)
Memory Module : Kingston 2GB DIMM DDR2 PC2-6400U DDR2-800 (5-6-6-18 3-24-6-3) <-----------------
Memory Module : Kingston 2GB DIMM DDR2 PC2-6400U DDR2-800 (5-6-6-18 3-24-6-3)
Memory Module : Kingston 2G-UDIMM 2GB DIMM DDR2 PC2-6400U DDR2-800(5-5-5-18 3-23-6-3) <------
Memory Module : Kingston 2G-UDIMM 2GB DIMM DDR2 PC2-6400U DDR2-800 (5-5-5-18 3-23-6-3)

You have two different memory module pairs with different timings. They will run at the slowest compatable speed.

That's what i tought, so that's why it's running at PC-5300?

So wich one is the fastest?

guileman said:

That's what i tought, so that's why it's running at PC-5300?

Most likely. The BIOS auto-recognizes memory and negotiates speed. It's not always what the spec says, especially when ruining different modules.

So which one is the fastest?

The second pair is the fastest of the two pair but make sure your BIOS will support the timing at the rated voltage.

With 4 chips, your voltage regulators will have a real tough time handling the speed. I am familiar with that board and you will be lucky to run it at 800mhz. When adding to the fact that you have 2 different types of memory... well I wish you luck. I think your best bet is to keep the memory at a lower speed and bumping up the speed of your processor.

As you know, your MB is old, so if you do a safe overclock you will get a few more years out of it with abit more kick. The memory timings have to be lax.

Now for Memory Voltage. Sometimes I have noticed more voltage is worse. When you have 4 chips and you increase the memory voltage you will put more load on the motherboard. I recently had a similar motherboard die due to this... It is burnt...