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676 posts

Ultimate Geek
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Topic # 175486 1-Jul-2015 12:03 Send private message

Hi, what are the 667 and 800 figures relating to RAM mean please?

I had 4x 2GB DDR-2 sticks and BIOS reported it was 667.  But when I removed 2 of them it changed to 800.
I assumed this meant I'd taken out slower RAM and left in 2 faster ones. But the 2 removed have 'PC800" on them.

Is it OK to mix the two ?

Thanks.


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Uber Geek
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  Reply # 1334942 1-Jul-2015 12:09 Send private message

In most cases it is OK to mix and match, but all installed modules will operate at the lowest common speed. Some motherboards may have compatibility issues with mixing speeds, in which case it likely won't boot




Windows 7 x64 // i5-3570K // 16GB DDR3-1600 // GTX660Ti 2GB // Samsung 830 120GB SSD // OCZ Agility4 120GB SSD // Samsung U28D590D @ 3840x2160 & Asus PB278Q @ 2560x1440
Samsung Galaxy S5 SM-G900I w/Spark

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Uber Geek
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  Reply # 1334955 1-Jul-2015 12:16 Send private message

In some cases loading all slots with ram will reduce the speed of the ram as the chipset can't handle the higher speed in all slots because of the load placed on it by having 4 dimms installed 

can I ask which motherboard you have that has this problem 




Asus Crosshair V Formula AMD FX8320 (3.8GHz), 8GB Mushkin BlackLine DDR2400, 1x Sapphire RX480 8GB OC 1352/2000, 2x Kingston V300 SSD's RAID0 Boot, 1x WDC WD2003FYYS RE4 2TB, 1X WDC WD1003FZEX 1TB, 1X  SAMSUNG HD103SJ 1TB, SilverStone ST75F-P (750W) Full Modular PSU, OS WIN10 pro x64, SilverStone RaVeN RV02B-W (with USB3.0 upgrade)




676 posts

Ultimate Geek
+1 received by user: 29


  Reply # 1334977 1-Jul-2015 12:37 Send private message

It's an Intel DQ45CB.  I bought it of TradeMe to replace one I thought was faulty. (As it was repeatedly BSOD)

But the new one did the same until I tracked the problem to RAM.  There's 2 Corsair sticks (they read 800 in BIOS) and 2 Strontium.
The Strontium ones seem to have gone bad as with them out it goes fine. The maunfacturer supposedly
offers a  lifetime warranty) but if mixing them is the problem....   although until it went faulty it was fine.  (LOL fairly obvious!)
So not sure which way to jump...   is it preferable all sticks are the same speed?   Would 800 be noticeably faster than 667 ?



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  Reply # 1334981 1-Jul-2015 12:50 Send private message

ADKM: is it preferable all sticks are the same speed?   Would 800 be noticeably faster than 667 ?


Preferable, but provided the motherboard and RAM step down appropriately, not required.
To be honest, if you're tolerating either of these speeds, you won't notice a difference between the two ;)




Windows 7 x64 // i5-3570K // 16GB DDR3-1600 // GTX660Ti 2GB // Samsung 830 120GB SSD // OCZ Agility4 120GB SSD // Samsung U28D590D @ 3840x2160 & Asus PB278Q @ 2560x1440
Samsung Galaxy S5 SM-G900I w/Spark



676 posts

Ultimate Geek
+1 received by user: 29


  Reply # 1334995 1-Jul-2015 13:22 Send private message

>To be honest, if you're tolerating either of these speeds, you won't notice a difference between the two ;)

Yes, that's what I suspected.  If I quality for warranty replacements so much thee better..  new RAM would cost about $100.
I filed an RMA request with Strontium over a week ago (on their website warranty page) but nothing heard back yet.

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