PC133 running at 66Mhz

jamesdait · 04-07-04, 08:13 AM

I was just wondering if PC133 SD-RAM could run at 66Mhz, and if it can does it run stable?

Foxie3a · 04-07-04, 07:47 PM

No, you can't underclock RAM, just like you cant lower the FSB of a processor.

but the motherboard might have a CPU:Memory ratio that would allow you to run the RAM at 133, and the processor at 66.

Welcome To The Forums.

craig588 · 04-07-04, 08:36 PM

yes you can. I have run my AXP system at 5X with a 100MHz FSB, and it has a barton 3000+ and mushkin level 2 black pc3500 ram in it.

and its obvioudly possible with my ES chip.

repo man11 · 04-07-04, 10:00 PM

Pc133 should have no problems at 66 MHz. But you may have a problem getting all of your memory capacity out of PC133 on a chipset that only supports 66 MHz FSB. But at worst you'll only get half of your memory capacity. It'll still work.

SimGuy · 04-08-04, 12:20 AM

Yes, PC133 SDRAM modules will run at PC66.

As RepoMan suggested, if you have a 440BX, 440LX, 430TX/VX, Via MVP3-4, ALI Alladin 5 or below, which can only recognize up to a maximum of 768 MB's of SDRAM (3 DIMM slots), then a high-density memory module will only be 1/2 recognized by your system.

High density modules (32xblah blah) are double the density of older modules (16xblah blah) and are only 50% recognized by the aforementioned chipsets.

To run at PC66, the SDRAM will automatically re-configure itself for operation at that speed. PC133 simply means that it will run UP TO a maximum of 133 MHz.

corrosion231 · 04-08-04, 01:59 AM

Quote:

Originally posted by Foxie3a
No, you can't underclock RAM, just like you cant lower the FSB of a processor.

but the motherboard might have a CPU:Memory ratio that would allow you to run the RAM at 133, and the processor at 66.

Welcome To The Forums.

seriously, who told you this crap, have you never heard of underclocking?

dippy_skoodlez · 04-08-04, 08:25 PM

Quote:

Originally posted by Foxie3a
No, you can't underclock RAM, just like you cant lower the FSB of a processor.

but the motherboard might have a CPU:Memory ratio that would allow you to run the RAM at 133, and the processor at 66.

Welcome To The Forums.

WTF are you talking about? I can run 100fsb on my barton, and Pc133 should run fine at 66.

04-07-04, 08:13 AM	Thread Starter #1
jamesdait Registered Join Date: Jan 2002 Location: Australia	PC133 running at 66Mhz I was just wondering if PC133 SD-RAM could run at 66Mhz, and if it can does it run stable?
	QUOTE Thanks

04-07-04, 07:47 PM	#2
Foxie3a Normal Member Join Date: Sep 2003 Location: Modesto, CA	No, you can't underclock RAM, just like you cant lower the FSB of a processor. but the motherboard might have a CPU:Memory ratio that would allow you to run the RAM at 133, and the processor at 66. Welcome To The Forums. __________________ Dual Xeon X5482 E0 3.2/12M/1600 (400x8 1.26v) Supermicro X7DWA-N, 14GB ECC/Fully Buffered (400, 5-5-5, 1.8v) Radeon 5770 1GB Triple LCDs (22/22/24") Boot: 5x SAS/15K Drives in RAID5 (~350mb/s) Storage: 17 hard drives from 10K to 15K RPM. All SCSI Hot Swap. PCP&C 1.2KW Single 12v, 90A Rail Auzen X-FI Prelude <- Digital -> Denon Receiver -> Sennheiser HD650 Headphones.
	QUOTE Thanks

04-07-04, 08:36 PM	#3
craig588 Member Join Date: Dec 2003	yes you can. I have run my AXP system at 5X with a 100MHz FSB, and it has a barton 3000+ and mushkin level 2 black pc3500 ram in it. and its obvioudly possible with my ES chip.
	QUOTE Thanks

04-07-04, 10:00 PM	#4
repo man11 Member Join Date: Dec 2001	Pc133 should have no problems at 66 MHz. But you may have a problem getting all of your memory capacity out of PC133 on a chipset that only supports 66 MHz FSB. But at worst you'll only get half of your memory capacity. It'll still work. __________________ Not really a repo man.
	QUOTE Thanks

04-08-04, 12:20 AM	#5
SimGuy Member Join Date: Jan 2003 Location: Ottawa, Ontario	Yes, PC133 SDRAM modules will run at PC66. As RepoMan suggested, if you have a 440BX, 440LX, 430TX/VX, Via MVP3-4, ALI Alladin 5 or below, which can only recognize up to a maximum of 768 MB's of SDRAM (3 DIMM slots), then a high-density memory module will only be 1/2 recognized by your system. High density modules (32xblah blah) are double the density of older modules (16xblah blah) and are only 50% recognized by the aforementioned chipsets. To run at PC66, the SDRAM will automatically re-configure itself for operation at that speed. PC133 simply means that it will run UP TO a maximum of 133 MHz. __________________ Merlin - The Primary System: AMD Athlon 64 FX-55 @ 3000 MHz :: Asus A8N-SLI Premium :: 1024 MB OCZ 3200 EL Rev.2 :: BFG GeForce 8800 GTX OC Lian-Li PC71 :: 36.7 GB WD Raptor :: 300 GB Maxtor DiamondMax 10 :: 21" Dell UltraScan P1110 :: OCZ GameXStream 700W
	QUOTE Thanks

PC133 running at 66Mhz

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