Simviation Forum - Is overclocking pc2100 to pc2700 a good idea?

Jul 17^th, 2003 at 8:32pm

Selbio Offline
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Hi all,
I'm running a 333fsb 2600+ cpu with two sticks of pc 2100 from crucial on dual channel.

I know that this processor runs best with memory that matches their fsb. What would happen if I change the memory setting from 133 to 166 on the bios? Will the chips go bad? Will changing the divisor on the Bios to make the memory run at 166 overclock other hardware automatically?

The reason I ask is because I went to www.buyaib.com where they sell some PC2700 chips and it says on there that some of their chips are pc2100 overclocked to pc2700 and they test them for 48hrs before shipping.

http://www.buyaib.com/sam2533pc27i.html
http://www.buyaib.com/kinpc184pin23.html

I finally overclocked the memory and did a stress test and so far the system hasn't crashed and I have even noticed that performance has increased noticeably.

The timings were at T-(RAS) 6, T-(RCD) 2, T-(RP)2 CAS2.5 when It was running at 266MHZ. After overclocking the memory to 333MHZ I noticed that by default it all went up to 8-3-3 CAS3.
I went in and changed everything back to 6-2-2 CAS 2 and I noticed that it made a difference when benchmarking, however; am I stressing the memory too much? Should I change it back to the SPD default 8-3-3 CAS3?

Any advice on this will be appreciated.

Best Regards,&&Selby&&

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Reply #1 - Jul 19^th, 2003 at 8:27pm

Selbio Offline
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I love YaBB 1G - SP1!

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Any suggestions anyone?

Best Regards,&&Selby&&

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Reply #2 - Sep 7^th, 2003 at 2:31am

Daz Offline
Colonel
in the morning im making
WAFFLES!
Leeds, UK

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sounds good i looked at the title and thought "nutter" but if it works it works

AMD athlon XP2800+ @2.34ghz&&Epox 8RDA3G 400 fsb, 8x AGP&&1024MB DDR400 PC3200&&XFX 256MB FX5950 Ultra (oc 525/1.04)&&40 gig maxtor 7200rpm&&80 gig seagate baracuda 7200rpm&&

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Reply #3 - Sep 7^th, 2003 at 6:56pm

4_Series_Scania Offline
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He who laughs last, thinks
slowest.
Stoke on Trent England U.K.

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I recently upgraded to 512 from 256MB, the "new" stick was 2700, and was'nt happy running @2100 (The PC rating of the "old" stick) , so, I re-configured my BIOS and have been running with effectively overclocked 2100 RAM without a hitch for about 6 months now............

However, "Nutter" is a description that isn't even close to my mark. Wink

Try it! - if you hear a bang, pop, hiss or see smoke from the back of your tower, I'd say it did'nt work. Grin

Posting drivel here since Jan 31st, 2002. - That long!

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Reply #4 - Sep 16^th, 2003 at 6:10pm

Chi_San Offline
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Ranma-Onna to Ranma Chan
Elsewhere

Posts: 54

I have PC 2700 RAM and I'm overclocking it a bit.

All I have to say is, stability. If your computer can't run stable with your RAM up that fast, don't do it.

Niku san wa tomodachi desu.&&&&~Chi san

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Reply #5 - Sep 20^th, 2003 at 7:24am

Ivan Offline
Colonel
No, I'm NOT Russian, I
only like Russian aircraft
The netherlands

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Quote:

Hi all,
I'm running a 333fsb 2600+ cpu with two sticks of pc 2100 from crucial on dual channel.

I know that this processor runs best with memory that matches their fsb. What would happen if I change the memory setting from 133 to 166 on the bios? Will the chips go bad? Will changing the divisor on the Bios to make the memory run at 166 overclock other hardware automatically?

The reason I ask is because I went to www.buyaib.com where they sell some PC2700 chips and it says on there that some of their chips are pc2100 overclocked to pc2700 and they test them for 48hrs before shipping.

http://www.buyaib.com/sam2533pc27i.html
http://www.buyaib.com/kinpc184pin23.html

I finally overclocked the memory and did a stress test and so far the system hasn't crashed and I have even noticed that performance has increased noticeably.

The timings were at T-(RAS) 6, T-(RCD) 2, T-(RP)2 CAS2.5 when It was running at 266MHZ. After overclocking the memory to 333MHZ I noticed that by default it all went up to 8-3-3 CAS3.
I went in and changed everything back to 6-2-2 CAS 2 and I noticed that it made a difference when benchmarking, however; am I stressing the memory too much? Should I change it back to the SPD default 8-3-3 CAS3?

Any advice on this will be appreciated.

Believe me, it is possible to downgrade memory performance regardless of the chips you use... The SPD can tell the mobo that a certain DIMM module is a CAS-2 DDR-2100, while the chips on it are DDR-2700 capable when running at CAS3 speed.

To be safe keep it at CAS3 when running on high speed...

Russian planes: IL-76 (all standard length ones), Tu-154 and Il-62, Tu-134 and An-24RV&&&&AI flightplans and repaints can be found here

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