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How to make DDR2-800 ram run at 800. Because it won't.


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10 replies to this topic

#1 Silhorn

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Posted 06 February 2018 - 06:31 AM

Hello,

I bought some ram DDR2-800 PC6400 and it won't boot into the linux mint desktop. If I change in BIOS settings the RAM frequency from 800 to 667 it works.

Memtest says that timing is DDR2-703 CAS 6-5-5-15. In bios the auto settings are:

AjiwRuA.png

 

It is running on 1.8v standard in BIOS.

 

What can I change to make it run at 800mhz.

 

I use another brand RAM cheap G Skill DDR2-800 5-5-5-15 and it runs fine on auto 800mhz.

 

I notice big change in FPS when playing games in 800mhz compared to downgrading to 667mhz. That's why I want to fix.


Edited by Silhorn, 06 February 2018 - 06:35 AM.


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#2 DavisMcCarn

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Posted 06 February 2018 - 04:45 PM

You got taken and you need to return that ram and buy it someplace else.


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#3 Silhorn

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Posted 07 February 2018 - 01:55 AM

Forgot to mention. I actually tried in another computer at 800mhz and it works. Still think it's faulty RAM?



#4 Platypus

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Posted 07 February 2018 - 02:11 AM

It's possible, maybe not faulty outright, but could be out-of-spec to a degree that one mainboard handles but the other does not. Sometimes RAM simply doesn't work satisfactorily with a particular board.


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#5 Silhorn

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Posted 07 February 2018 - 03:49 AM

ok I am going to contact seller see if I can maybe return and get another one.

 

Thanks for the help guys.



#6 The-Toolman

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Posted 07 February 2018 - 05:34 AM

Are you running 4 sticks of memory when this occurs and is your processor an AMD.

 

I have found on some motherboards using 4 sticks of ram can overload the memory controller and so the mother board lowers the memory speed to 677 MHz FSB.

 

This seems to be an issue on some older motherboards that using AMD processors and 4 sticks of DDR2 memory or has been from my own experience.

 

Just a thought.


Edited by The-Toolman, 07 February 2018 - 05:42 AM.

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#7 DavisMcCarn

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Posted 07 February 2018 - 07:57 AM

That "DDR2-703" you posted says that the memory is really 667Mhz that can be overclocked.  Setting it to Auto should have shown 800 without needing to force it.


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#8 jonuk76

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Posted 07 February 2018 - 09:06 AM

Are you running 4 sticks of memory when this occurs and is your processor an AMD.

 

I have found on some motherboards using 4 sticks of ram can overload the memory controller and so the mother board lowers the memory speed to 677 MHz FSB.

 

This seems to be an issue on some older motherboards that using AMD processors and 4 sticks of DDR2 memory or has been from my own experience.

 

Just a thought.

 

That is a good point, some chipsets/memory controllers need to run at a lower speed when two DIMMs per channel are used.  That extends to current systems like Ryzen which "officially" only support DDR4-2400 when 2 DIMMs per channel are used (even though in reality many will work at higher speed).

 

Mixing different CAS latencies in the same system could also cause issues.

 

CPU-Z shows the SPD holds timings for DDR2-800.  Could the "DDR2-703" reference not just be a bug or peculiarity in how Memtest determines memory speed, as it's neither 667 mhz or 800?


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#9 Silhorn

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Posted 10 February 2018 - 05:35 AM

I have tried using it by itself and also using 3 sticks of ram. The other 2 being g skill ones.

 

When first used I did not force it to 800mhz. Was originally like shown in the screenshot. The problem was that at that setting it did not allot me to boot past linux splash screen. Putting in in 667mhz did.

 

Since my last post in this topic I did a search of the model number on google. This ram was cheap ram I bought from ebay and seems like people who bought the same ram have done some testing too.

 

They say it runs very well on 667 mhz but unstable on 800. And on reviews from other shopping sights of same ram, some people can't boot at all with it.

 

I have contacted seller who says is contacting supplier. Don't know how that will turn out. 

 

Here is link to original listing. 

https://www.ebay.com.au/itm/4GB-4G-Memory-RAM-DDR2-800Mhz-PC2-6400-240-pins-Dimm-For-AMD-Motherboard-CPU/132311776960?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649


Edited by Silhorn, 10 February 2018 - 05:37 AM.


#10 OldPhil

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Posted 10 February 2018 - 07:45 AM

Many times mixing brands do not play well together even though the spec reads the same.


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#11 DavisMcCarn

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Posted 10 February 2018 - 08:13 AM

Memtest got that DDR2-703 number by querying the memory and, plain and simple, 703 is not 800.  EBay will let you return it because the item is "not as described" and will forcibly ram it down the sellers throat if it comes to that.  Buy something else that is really DDR2-800.

P.S. Just because it works in another PC with different timing does not change the fact that it is not DDR2-800.


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