Can I under clock RAM ?

PC_user · 05-25-2007, 05:57 AM

I have an ECS RS482-M motherboard. According to specification, it supports DDR266/333/400. My firend has a spare PC2-5300 DIMM DDR2-667. I was wondering if I can use it on the motherboard with the understanding that I will only get DDR2-400 speed.

**crazijoe** · 05-25-2007, 06:30 AM

Well the bad news is the PC2-5300 DIMM DDR2-667 will not work in your machine. Your motherboard will only support DDR memory and not DDR2 memory.

**TheMatt** · 05-26-2007, 03:08 PM

Correct, it physically won't fit into the slot. So don't try.

Some more info. RAM that runs faster than the memory bus on a motherboard will automatically clock down to the speed of the memory bus. So, if your board takes only DDR2-533 MHz RAM or slower and you put in a stick of DDR2-667 MHz RAM, it will only run at 533 MHz.

05-25-2007, 05:57 AM	#1 (permalink)
PC_user Registered User Join Date: Oct 2004 Posts: 9 OS: XP	Can I under clock RAM ? I have an ECS RS482-M motherboard. According to specification, it supports DDR266/333/400. My firend has a spare PC2-5300 DIMM DDR2-667. I was wondering if I can use it on the motherboard with the understanding that I will only get DDR2-400 speed.

05-25-2007, 06:30 AM	#2 (permalink)
crazijoe Moderator, Hardware Forums Join Date: Oct 2004 Location: Omaha, The Center of the Universe Posts: 7,632 OS: WinXP, Win2K3 My System	Re: Can I under clock RAM ? Well the bad news is the PC2-5300 DIMM DDR2-667 will not work in your machine. Your motherboard will only support DDR memory and not DDR2 memory. __________________ Microsoft MCSA + Messaging, MVP, A+, Network+ Do you want a real Republican? HDD diagnostic tools / HDD data recovery software

05-26-2007, 03:08 PM	#3 (permalink)
TheMatt Moderator, Hardware Team Join Date: May 2006 Location: Boston Posts: 13,695 OS: Win 3.1, 98, NT 4.0, XP Debian 4.0, Kubuntu 6.06 My System Blog Entries: 3	Re: Can I under clock RAM ? Correct, it physically won't fit into the slot. So don't try. Some more info. RAM that runs faster than the memory bus on a motherboard will automatically clock down to the speed of the memory bus. So, if your board takes only DDR2-533 MHz RAM or slower and you put in a stick of DDR2-667 MHz RAM, it will only run at 533 MHz. __________________ - Matt M - KB1OSC - Folding@Home 85015 If TSF has helped you, please consider donating. If I have stopped responding to a thread, feel free to send me a PM with a link to the thread. It is advisable to subscribe to threads so you will receive updates when replies are posted. You can subscribe to threads from the "Thread Tools" Menu. »Memtest86 »Prime95 »UBCD »SpeedFan »NHC Personal »Everest »Sandra »PC Wizard »RivaTuner »ATi Tool Click here for Useful Articles and Guides