Real non-stupid overclocking questions

[c627627]

No no not 8RDA,
8RDA+ (the plus version)

What about the downsides to PC2100 that can get you
2100+ @ [206] FSB x 11 = 2266 MHz (2800+)
at 1.75 V with 36(min) to 42(max) C ?

 

[jonspd]

correct opp's

http://www.amdforums.com/showthread.php?s=&threadid=203250
no downside except maybe what timing your useing.

 

[c627627]

Thank you jonspd.
How important is memory timing to actual performance "that can be felt" in this case:

2x 256MB Kingston (Hynix chip) PC2100 7 3 3 3 @ 6 3 3 2.5
2100+ AIUHB 0248
[206] FSB x 11 = 2266 MHz (2800+)
at 1.75 V @ 36(min) to 42(max) C
Epox 8RDA+
Thermalright SK-7 with variable speed 80x25mm YS-Tech FD1281259B-2F
GeForce4 Ti4200 ; Antec SX-835II case ; Antec SmartPower SL350

 

[jonspd]

The timing in my book is kinda like hd seek time.

A hard drive with 10 ms seek time will not preform as well as a hard drive with 8.8 seek time.

Assuming that ram is running @ 200 fsb 7 3 3 3 or @ 190 5 2 2 2.0 I would take the 5 2 2 2.0 over the 200 fsb.

 

[c627627]

OK. So it's worth at least 10 FSB you say.

Taking 2x 256MB Kingston (Hynix chip) PC2100
from 7 3 3 3 to 5 2 2 2 or 5 2 2 2.5 or 5 3 3 2.5 will fail Prime95 after 3 hours or so.

206 FSB on
2x 256MB Kingston (Hynix chip) PC2100 from
7 3 3 3 to 6 3 3 2.5 is rock stable

Thanks again for your advice.

_____________
2100+ AIUHB 0248
[206] FSB x 11 = 2266 MHz (2800+)
at 1.75 V @ 39(min) to 46(max) C
Epox 8RDA+
Thermalright SK-7 with variable speed 80x25mm YS-Tech FD1281259B-2F
GeForce4 Ti4200 ; Antec SX-835II case ; Antec SmartPower SL350

 

[jonspd]

OK. So it's worth at least 10 FSB you say.

I would say @ most 10 fsb not least and 10 is kinda on the boarder maybe 6 or 8 but 10 is a option you will have to make.


It would also depend on the multiplier 10 @ 10x maybe 10 @ 13 maybe not.

10 x 190= 1900
10 x 200= 2000

= 100 mhz

15 x 190= 2850
15 x 200=3000

= 150

 

[Samoyed]

The difference between running GOOD memory at the most agressive timings ( which it CAN do ) vs avg memory at moderate timings ( which is the BEST it can do ) is about 5-7% in 3D Mark.


How does this relate to FSB speeds? My old 1800 at 145fsb agressive memory timings was = to about 150 fsb at moderate timings and it was more stable.

DDR 333 vs 266? For a CPU with a 133 FSB stock like yours it probaby doesnt make a huge difference. I have heard that its better to have the memory run at 2X the FSB. That's one reason why the KT400 boards using DDR 400 run faster using DDR 333.

I see your memory problem as being low quality memory that will not run agressive timings at a high FSB. That's why I would get CAS 2 ram like XMS.

 

[maver1ck]

c627627, youve got your Kingston PC2100 running at 206FSB??

Whoa....... Ive got Crucial PC2100 in my rig....... Im going to try and inch my FSB up. Id get twinmos 3200 ram if I had enough money

 

[Pla]

I had 256MB Crucial pc2100 and was able to push it to 166 fsb with the most relaxed timings 2.5 3 3 6 2T. It was 100% stable. If I tried to lower any of the timings it wouldn't post though.

 

[c627627]

Originally posted by maver1ck c627627, youve got your Kingston PC2100 running at 206FSB??

Yes but 5 2 2 2 and 5 2 2 2.5 and 5 3 3 2.5 failed Prime95 after 3 hours or so.

206 FSB on
2x 256MB Kingston (Hynix chip) PC2100 is stable only on
7 3 3 3 to 6 3 3 2.5

and with:
________________
2100+ AIUHB 0248
[206] FSB x 11 = 2266 MHz (2800+)
at 1.75 V @ 40(min) C to 47(max) C
Epox 8RDA+
Thermalright SK-7 with variable speed 80x25mm YS-Tech FD1281259B-2F
GeForce4 Ti4200 ; Antec SX-835II case ; Antec SmartPower SL350


EDIT: increasing to 1.8 V you can get 6 2 2 2
and [208] x 11 = 2288 MHz @ 37 to 46 C
(and no desire to OC further.)

 

[c627627]

Is there any downside to
[higher] FSB x [lower] multiplier
over
[lower] FSB x [higher] multiplier to get the same MHz?

Well actually there is, isn't there:
If your mobo doesn't have a PCI lock that means that too high of an FSB may take your hard drive and PCI cards too far out of specs.

 

[Zoda]

All I can say is wow.. This post has so many answer to so many questions that can help a newbie out.. Thanks a lot!

 

[-N-]

jeez seriously.. I'm gonna keep pushin my fsb to it's max and see which fsb combo gives me the best sandra scores..

thanks for this thread lol.

 

[Jarhead7236]

"... if you’re lucky to own an nForce2 with PCI lock (Epox, Abit, Asus, Chaintech)"
Leadtek and MSI do not have a PCI lock.

MSI does have PCI lock....

 

[c627627]

Funny you should post that today, since M pro almost took one for the team this morning trying to prove things either way in this thread:
http://forum.oc-forums.com/vb/showthread.php?threadid=216639

Yes MSI does have a PCI lock and Gautam concluded the whole controversy with this excellent post:

Looks like your bravery rewarded us all . No normal hard drives(like your Maxtor and Western Digital) could possibly take a 43mHz PCI bus. There's a 1% that its actually just using a 1/4 divider to run the PCI bus below spec. But I doubt this, and it looks your particular board has a PCI lock. I'm also beginning to believe that just about all MSI nForce2 boards do. Looking at the Anandtech article, there is no evidence contrary to this, other than MSI's statement, which the moderators at their forum deny. I don't know anything about MSI's line of motherboards. Abit, for example, had three revisions prior to their Ultra 400 offering. Even their very latest pre-Ultra, the 1.2, had some corruption issues at high front side buses. The first ones were hard pressed to even reach 190. Perhaps MSI's have gone through a few revisions, only the first of which lacks a PCI lock, and perhaps is very rare. You don't see many NF7-S revision 1.0 these days, either. Could someone here clarify whether or not these boards have revisions? And which revisions do people own?

 

[Koranuso]

awesome thread, i didnt understand any of this until now.

my roomy kept lookin at me like i was stupid just cause i didnt know what cas meant....lamer

 

[culinist]

All nForce2 motherboards have the ability to lock the PCI bus. All ya gotta do is set the AGP Speed at 66MHz in bios this locks PCI at 33.

 

[c627627]

We now know they do but you want to write to MSI to try to find out who told Anandtech their first release nForce2 did not have a PCI lock?

http://forum.oc-forums.com/vb/showthread.php?s=&threadid=216639

We know Anandtech did not make a mistake because they responded to inquiries about it and confirmed MSI telling them this.

We know for sure MSI nForce2s do have a PCI lock but that statement cost them a lot of sales with overclockers.

 

[Fangs404]

dang, i think this deserves to be a sticky.

 

[c627627]

You bumped a thread that's a year and half old, lots has changed since then.... hitechjb1 describes things in greater detail...