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Is this actually DDR2 1066MHz memory


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#1 espoo_hopper

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Posted 03 July 2017 - 02:53 PM

Hi

 

I'm looking to resolve a problem which may not be a problem. I have just bought 4 x 2Gb of Kingston HyperX on eBay for my latest build. Each is clearly marked KHX8500D2K2/4G as two matched pairs and was advertised and purchased as DDR2 1066MHz. I fitted them to my MSI MS-7512 motherboard running a Xeon X3360 CPU and Windows 7 Pro and was surprised to find they came up as 800MHz in BIOS. In Speccy they were 400MHz, so dual channel again indicated 800MHz. I checked the manual to ensure everything in (AMI) BIOS was auto detected and using Memory Z I found the serial number of each module -

 

800B3162

800B8762

800C493B

A40A7ECD

 

 Seeing the prefix 800 on three of them has me worried. Memory Z also stated -

 

DDR2 SDRAM

Max bandwidth DDR2-800 (PC2-6400, 400MHz)

Kingston

2G-UDIMM

 

Am I missing something or have I forgotten something? All the modules are clearly and identically labelled KHX8500D2K2/4G and show no signs of tampering. Any help most welcome. Please be aware that you will be communicating with a computer illiterate with limited knowledge.

 

Many thanks

 



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#2 Drillingmachine

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Posted 03 July 2017 - 03:34 PM

I fitted them to my MSI MS-7512 motherboard running a Xeon X3360 CPU and Windows 7 Pro and was surprised to find they came up as 800MHz in BIOS. In Speccy they were 400MHz, so dual channel again indicated 800MHz. I checked the manual to ensure everything in (AMI) BIOS was auto detected and using Memory Z I found the serial number of each module -


https://www.kingston.com/dataSheets/KHX8500D2K2_4G.pdf

Each module pair has been tested to run at DDR2-1066MHz at a latency timing of 5-5-5-15 at 2.2V. The SPD is programmed to JEDEC standard latency 800Mhz timing of 5-5-5-18 at 1.8V.

Adjust speed manually to 1066 MHz on BIOS and also voltage to 2.2V. And how you exactly do it, depends on BIOS. There are endless amount of different BIOS's.

Edited by Drillingmachine, 03 July 2017 - 03:36 PM.


#3 espoo_hopper

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Posted 03 July 2017 - 03:49 PM

Hi Drillingmachine

Many thanks for your speedy reply. I've looked at the link you kindly supplied. Could you possibly give me a little more of a pointer how to choose the correct SPD settings that I need to alter before I make a hash of it. I appreciate that this may not be possible without specific knowledge of the motherboard BIOS. Many thanks.

#4 espoo_hopper

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Posted 03 July 2017 - 03:51 PM

Additional -

Sorry, but I didn't see your last point straight away, so my last post was not appropriate.

#5 jonuk76

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Posted 03 July 2017 - 04:11 PM

Often there are sections called something like "Advanced Memory Settings" or "Advanced Chipset Settings", something of that nature. DRAM Voltage may be in with the memory timing, or may be in a different menu.  On this era system, you also usually have to set the FSB:DRAM ratio (thankfully, often there are automatic settings for DDR2-533,667,800,1066 etc).  The FSB (Front Side Bus) for this CPU is 333 mhz before the multiplier, while you want the memory to run at 533 mhz (which gives an effective speed of 1066 mhz), so it's a ratio of 1:1.6 or something like that.  

 

I would add you are fairly unlikely to notice the difference between 800 and 1066 mhz memory, except in timed benchmarks.


Edited by jonuk76, 03 July 2017 - 04:12 PM.

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