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1066Mhz downclocked to 800Mhz

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June 29, 2009 1:14:59 AM

i hope people wont get tired of answering these questions but i still cant figure it out after searching the answers for quite some tome already:

Here's the memory information:

KHX8500AD2K2/4GR
4GB Memory Kit
4GB PC2-8500 CL7 240-Pin DIMM Kit (2 pcs.)
Assembled in China

08 1814

bought in from fry's electronics:

it says also from the Fry's sticker:

4GB PC8500 Dual Hyper X
(2x2 GB) Speed 1066Mhz
lifetime warranty

$ 129.99


I cant seem to find my memory (KHX8500AD2K2/4GR) in kingston's website.

I cant also find out if my memory sticks are Single Channel or Dual Channel

The closest i could find were:

for single channel:

KHX8500D2/2G 2GB DDR2 1066MHz Non-ECC CL5
5-5-5-15 2.25V

*(i probably have 2 pcs. of these)

for dual channel:

KHX8500D2K2/4G 4GB DDR2 1066MHz Non-ECC CL5 (kit of 2 – 2GB)
5-5-5-15 2.2V

*(or i probably have 1 set of this)

im guessing that what i have is the dual channel kits but i cant be sure since it is said in the box that i have purchased
that the kit is named KHX8500AD2K2/4GR not KHX8500D2K2/4G.

The main problem i am having is that i can't seem to run these memories to their specified speed of
1066Mhz. It is downclocked to 800Mhz only.






Here's what i tried to do:

i was looking at these sites before i tried to change the settings in BIOS:

http://www.kingston.com/hyperx/produ...ddr2.asp#1066d

and this

http://www.valueram.com/datasheets/KHX8500D2K2_4G.pdf

*sigh* here's the last thing i did.

BIOS>Cell Menu:

FSB/Memory Ratio from [1:2] to [1:2.66]

the Adjusted DDR Memory Frequency changed from [800] to [1066]

then the next thing i did was to head to the

"Memory Voltage" and from [Auto] to [2.20]

*2.20 Volts had e red highlight in it and is said that it is not a recommended setting

then i went to Advance DRAM Configuration>DRAM Timing Mode from [Auto] to DCT 0

i set the DCT 0 to the ff configuration:

CAS Latency (CL) = 5 CLK
TRCD = 5 CLK
TRP = 5 CLK
tRTP = [Auto]
TRAS = 15 CLK
TRC = [Auto]
tWR = [Auto]
TRRD = [Auto]
tWTR = [Auto]
tRFC0 = [Auto]
tRFC1 = [Auto]
tRFC2 = [Auto]
tRFC3 = [Auto]


(i also changed a setting from 2T to 1T
)
*anyway i had the ff options for CAS Latency:

Auto
3 CLK
4 CLK
5 CLK
6 CLK
7 CLK DH_Only (what is this?)

then i saved it and then it rebooted

then i get this msg:

CMOS Checksum Bad
Press F1 to Run Setup
Press F2 to load default values


my system specs:

Phenom 9950 BE
K9a2 Platinum v 1(790FX + SB600)
4870 512mb
650watts
a b } Memory
June 29, 2009 1:29:05 AM

The MB will default the PC28500 1066MHz Dimms to PC26400 800MHz data transfer rates because there is no JEDEC standard PC2 8500 1066Mhz. In BIOS, set the RAM manually to 1066Mhz. 5-5-5-15 which may require slightly more voltage than PC2 6400 800MHz. Try 2.0-2.1v.
June 29, 2009 1:50:10 AM

badge said:
The MB will default the PC28500 1066MHz Dimms to PC26400 800MHz data transfer rates because there is no JEDEC standard PC2 8500 1066Mhz. In BIOS, set the RAM manually to 1066Mhz. 5-5-5-15 which may require slightly more voltage than PC2 6400 800MHz. Try 2.0-2.1v.


uhm is that not what i did? (sorry im not meaning to be rude sorry sorry sorry) i already did what u said even 2.0 to 2.1 to 2.2 volts..

u probably didnt read my first post as much since i guess the length is kinda boring!

thanks for the quick reply tho :D 
Related resources
a b } Memory
June 29, 2009 1:57:59 AM

So we know about your Kingston RAM. What are the specs of the rest of your system? Increase the NB voltage to 1.4v-1.5v.
a b } Memory
June 29, 2009 2:03:37 AM

Is there a BIOS update that addresses a fix for memory regarding the memory speed and stability?
a b } Memory
June 29, 2009 2:04:38 AM

I would return the memory if it will not run at it's advertised speed.
a b } Memory
June 29, 2009 2:23:23 AM

What badge said about memory speed.

Single/dual channel is a function of the motherboard not the memory.

RAM overvolt warning is a typical warning built into many BIOS's. If you are running your RAM at factory recommended values for your speed, ignore it.

CMOS checksum warning is an indication of a usually minor BIOS problem, not a main memory problem. You can usually clear it by entering the BIOS and simply resaving your existing settings. If not, clear the BIOS by however the motherboard manual recommends and reenter your BIOS settings.

At DDR2-1066 speeds, your "1T" setting may not be stable.
June 29, 2009 2:36:51 AM

thanks the memory managed to run in 1066Mhz

i listened when someone said that i should set it so CL 7

he/she said that i should run is 7-7-7-21 so...

here's what i tried to do:

went to DRAM Timing Mode and chose
Both:

by choosing both, the timing options of DCT 0 and DCT 1 were both shown!

then i set the CL to 7 (the option was actually named CL 7 DH_Only) of both the DCT0 and 1

so the only thing left for me to do was to change the

trcd
trp
tras


all to 7 but the options given to me were only up to 6 CLK

so i left those and everything else set to [Auto]

then i changed the FSB/Memory Ratio from 1:2 to 1:2.66 that gave me 1066 Mhz for the memory

then it booted magically to windows!

here is the specs of the memory accdg to cpu-z:





would it be better for me to go back to 800Mhz with 6-6-6-18?

isnt 2.2volts overkill? (but accdg to the kingston website it doesnt seem so)

and is there a good program to test my memory stability of my new settings?
a b } Memory
June 29, 2009 2:48:34 AM

I would be unhappy with that memory if advertised rate of 5-5-5-15 1066MHz needed to be downgraded to 7-8-8-24 timings. Where would you be if you overclocked the system BUS. At least the DIMMs will transfer data to the CPU at 8.5GBs/sec., but with a slow response time of 7 CAS. I don't have any DDR2 running at 7 CAS, all mine are 4-5 CAS.
June 29, 2009 6:22:05 AM

badge said:
I would be unhappy with that memory if advertised rate of 5-5-5-15 1066MHz needed to be downgraded to 7-8-8-24 timings. Where would you be if you overclocked the system BUS. At least the DIMMs will transfer data to the CPU at 8.5GBs/sec., but with a slow response time of 7 CAS. I don't have any DDR2 running at 7 CAS, all mine are 4-5 CAS.


man i wish i had a system like urs! :D 

maybe i should just get back to ddr 2 800 Mhz 6-6-6-18 and try to run at 5-5-5-15/16 timings?

and the 7-8-8-24 @ 2.2 hates me.. games hang up and i get random restarts!

and i just learned a few moments ago how to run in DUAL channel :) 
a b } Memory
June 29, 2009 12:45:10 PM

tubers said:

(i also changed a setting from 2T to 1T
)
*anyway i had the ff options for CAS Latency:


Here is likely your biggest problem, leave this a 2T, and set everything else to the advertised specs of 1066/5-5-5-12 and voltage of 2.2
April 3, 2010 4:55:36 PM

Well to inform you all this memory isnt labled on kingston site as it was removed due to many people complaining about its perforamcne i had it one time and the CL = 7

timing for this memory is 7-7-7-20 @ 2.0 -1066mhz OR 800 @ 6-6-6-18 @1.8

This is the manufactuer settings , the memory will show up on JEDEC right to 400mhz on cpuz but i had to run through millions of sites and finnaly after 3 months of running it @ 800 kingston replyed and gave me the correct settings . Enjoy
a b } Memory
April 3, 2010 5:36:25 PM

IF the memory will not work at the rating of 5-5-5-15 @ 1066 speed - I would definitely return it for a refund !!! - $129 is way too much to pay for CAS 7 RAM (what it is stable at) I mean you can get 4GB of Patriot Ram that will run at CAS5 properly for $109 - $20 MIR so $89.99 on newegg ( Linkie )
September 22, 2010 12:00:41 AM

I use the same ram in my setup
MOBO P5Q Pro Turbo
CPU Q9550 @ 400x7.5 3GHz 1600MHz FSB
RAM 4 KHX8500D2\4G totalling to 8GB very similar to yours

on the RAM module it says 2.3V on Kingston WEBSITE it says 2.2v
this is the.
site http://www.kingston.com/hyperx/products/khx_ddr2.asp

And if you run this ram at CL 4, 4, 4, 12, with the TRFC @ 40 and voltage at 2.2v @ DDR2 PC800
it will run stable. hopefully this is useful and you have to program the JDEC manually.

If you run this ram @ 1066 at 2.2 volts the timings have to be 5,5,5,15 TRFC at 50 this also runs stable for me.

And the ram voltage is named DRAM in computers BIOS.
!