Your 2.6c is @ 3.1GHZ+, yay or nay?

[dbwillis]

Mine is doing 255fsb, 1.6vcore, temps are IDLE and LOAD

 

[batmang]

well, no matter what cpu you get, you wanna make sure you get good oc'able ram if your going to oc. id recommend getting a Abit IC7 motherboard, 2.4c, Artic Silver 3 or Ceramique, both are awesome, but the Ceramique isnt conductive, Corsair 3500 XMS 2x256 if on budget, or 2x512 if u got spare cash. That zalman should keep it nice and cool. The ic7 seems to be getting the higher oc's compared to the IS7's. And i recommend you buy all your stuff from www.newegg.com , best place ever.

 

[oldfart]

2.6C is not worse than 2.4C. The opposite is true. All of them have the potential to hit the same speed. The 2.4C needs a higher FSB and ram speed to hit the same CPU speed. You can run into mobo or ram limitations on a 2.4C that you wont on a 2.6C.

Overclockers.com database:

Pentium 4 2.4 800 Results....
Total Entries in Database for Pentium 4 2.4 800 - 57
Average overclocked speed - 3323 Mhz


Pentium 4 2.6 800 Results....
Total Entries in Database for Pentium 4 2.6 800 - 21
Average overclocked speed - 3474 Mhz

 

[stevejst]

coo coo, thanks. im gonna try doing the 1:1 ratio, although i have Geil 3500 ultra platinum ram.

GEIL Ultra Platinum will run 490 MHz on 2.8V and since it has heavy heatspreaders you can do that. I am running it 1:1 (2.5-4-4-8) in dual channel and it is a great memory. I relaxed my 2.4 on 225, just don't need the heavy noise I am getting on Smart Fan full speed. But GEIL is quite a surprise for me after all my crapy attempts using GEIL in N-Force 2 mobos.

 

[Slammy1]

Originally posted by: oldfart
Overclockers.com database:

Well, those numbers are a bit skewed. Somebody posted they got 2.4GHz on the 2.4. LOL. Overall I'd say it offers more options. Look at the high 1:1 o/c's with the 2.6. If I ran on a 1:1 at my current memory speed, I'd be 2.69GHz. With a 2.6 processor, I'd be 2.9 which is respectable on a 1:1.

 

[stevejst]

Don't believe anything on that overclockers database. Just for fun I posted my fake numbers about a a year ago and it is still there though it has no connection with reality at all. So I would not believe anything that is there.

 

[oldfart]

I know OC database is not perfect. I see what "real" people get here and a few other forums. 3.3 - 3.4 Ghz is pretty much the norm for a 2.4 and 2.6C CPUs. Some only get to 3.0 - 3.1, some get to 3.5 - 3.6. Its luck of the draw. There is no reason why a 2.4C would overclock better than a 2.6C. Many mobos have a problem @ high (275+) FSB speeds that a 2.4 needs to get there.

People who limit their overclocking by using a 1:1 ratio are doing it wrong. A 2.4C and 2.6C need to use 5:4 to get the FSB high enough to get the CPU speed whre it needs to be..

 

[Slammy1]

So, assuming a 5:4 ratio, the best bet would be a 2.4? I run 3.4GHZ (12X280) on a 5:4, but I'd be at a lower memory speed on the 2.6 at that speed. The limit for all the processors seems to be 3.6GHz unless you resort to extreme cooling solutions, so that to me indicates the slowest that can run it at the desired speed at the given ratio. I still think the 2.6, even though I can run this thing up a few more MHz when I get comfortable that this o/c will not blow up any components. The 13X multiplier gives the potential for higher o/c's. The only thing you lose in CPU options is the 2.4 - 2,6 range, and that range sucks anyway. However, if I had to do it all over again I want the cheapest with an intended Prescott upgrade in the future.

 

[solofly]

Originally posted by: oldfart
The 2.4C needs a higher FSB and ram speed to hit the same CPU speed.

Which is what every overclocker wants. The higher the FSB, the faster it goes...

 

[stevejst]

People who limit their overclocking by using a 1:1 ratio are doing it wrong. A 2.4C and 2.6C need to use 5:4 to get the FSB high enough to get the CPU speed whre it needs to be..

That depends what memory you have. Having PC 4000, PC 3700, or even a good PC 3500 enables you to do 1:1 on a high bus speed. Having a high memory bandwidth is essential to have a good performance.

I know OC database is not perfect. I see what "real" people get here and a few other forums. 3.3 - 3.4 Ghz is pretty much the norm for a 2.4 and 2.6C CPUs. Some only get to 3.0 - 3.1, some get to 3.5 - 3.6. Its luck of the draw.

You don't have to tell me that. My 2.4C goes easily over 3.3 GHz with integer benchmark (Dhrystone ALU) over 10,000 and floating Whetstone iSSE2 of 6,500. No Athlon overclocked on air can touch that, and I am still not at the ceiling.
But in a long run I don't think I'll run it over 3 GHz. I think with decent PC 3700 one should stick to 1:1 and keep it safe on 3 GHz. I want this system to last, I love it.

 

[oldfart]

That depends what memory you have. Having PC 4000, PC 3700, or even a good PC 3500 enables you to do 1:1 on a high bus speed. Having a high memory bandwidth is essential to have a good performance.

So called PC3700 - 4000 typically operate at pathethetic 3-4-4-8 timings. 1:1 @ those timongs can actually be SLOWER than 5:4 @ fast timings. I've seen it happen several times like this guy who spent big $$ for PC3700:

Upgraded to XMS3700 but lower 3DMARK03 score!?

By using 3DMark03 to judge what is my maximum FSB/memory/video setting for my P4 2.8c cpu on my Asus P4C800, I obtained the following results:

1) no name PC3200 (1G); FSB=235; 5:4 ratio; 2-3-3-6 SPD; result = 4375, CPU=730

2) Corsair XMS3700 (1G); FSB=235; 1:1 ratio; 3-4-4-8 SPD; result = 4316, CPU=759

3) Corsair XMS3700 (1G); FSB=250: 1:1 ratio; 3-4-4-8 SPD; result = 4328, CPU=810

This review says the same. Slow timings suck. You are better off 5:4 with fast timings. My own testing shows the same. There is a lot of pimping of PC3700 slow memory going on. It's not worth it.

Which is what every overclocker wants. The higher the FSB, the faster it goes...

True for the most part to a point. When you are talking these kinds o speeds, not really true. There is another problem:

Ram and FSB requirements with a 3.4 GHz overclock:

2.4C
12 x 283 FSB = 3.4 GHz
1:1 ratio = DDR566
5:4 = DDR453

2.6C
13 x 261 = 3.4 GHz
1:1 = DDR523
5:4 = DDR417

Many mobos have problems @ FSB speeds such as 283. A 2.6C keeps the FSB speed at a more manageable level. Also memory quality is tough to deal with. A 2.6C with a 5:4 ratio is a sweet spot. You can still get good ram @ a decent price that will run tight timings @ that DDR speed and have good performance.

 

[batmang]

I cant even get my fsb at 250. I can hit 246, which is 3.2ghz, but its not 100% stable and its 2 mhz shy of 200 mhz ram. So annoying, hehe. Right now its 100% stable at its current fsb, tested using prime95 x 2. But my vcore is already high, i dont know why im having a hard time hitting 250fsb. See my signature for full details. If you have any clue as to why i cant hit 250fsb with 5:4 ratio, with a reasonable vcore, that would be great.

 

[stevejst]

It isn't motherboard since I got 275 easy on the same motherboard, with the same memory, on 2.4C with 1.55V core. And I did not even try to go higher, I am sure it can.

 

[batmang]

damn.... makes no sense to me, u have same mobo, same ram, a 2.4c, stock vcore, and ur running faster then me. I have same mobo, same ram, a 2.6c, 5:4 ratio, 1.65vcore, 2.8vdimm, and im doing 3.12ghz....whats ur game accel settings steve? Hell, whats all your settings, and components. Whats ur fsb/ram timings/vdimm/ what kinda heatsink/fan/paste/psu? Maybe i need to start clean with the artic silver ceramique, maybe i put too much on?

 

[oldfart]

It's luck of the draw. Not all CPU's will overclock the same. You buy it, give it your best shot, thats all you can do. Some make it to 3.4 - 3.6, most dont. I've seen more than one that wont go above 3.1. Thats the breaks.

I run an IC7, but I'll post my settings if it helps.

257 FSB = 3.34 GHz
PSB = 800
ratio = 5:4
all GA = auto
timings = 2-6-2-2
Vcore = 1.6
Vdimm = 2.8
VAGP = 1.55

How are your temps? AS should be put on VERY THIN. I use a baggie on my finger to spread it....THIN.

 

[stevejst]

I am not running 275 24/7. I tried 275 and it was fun but my cooling is not attractive in that situation. I have Zalman 5700D-CU with TT SmartFan 2 so on 275 I need the full speed and that is noisy. I cannot stand that 24/7 so I slowed it down, still experimenting to find the max with 1:1 memory.
Nothing particularly tweaked except the voltages and timings.
My timings for GEIL are 2.5-4 (tCRD)-3-7 up to 238 passing memtest86 and 2.5-4-4-8 on higher, using 2.8V. 275 of course must be 5:4. I am sure this can go higher but I did not try. I need SLK-800U or SLK-900 to go higher. No money right now for that.
I am very happy with the mobo and CPU, it is a significant benchmark improvement over AMD, I have bunch of these.

 

[oldfart]

A nice, quiet setup is a Swiftech MCX4000 and a Panaflo M1A. Cools really well, and I can't hear it at all.

 

[solofly]

Originally posted by: oldfart
True for the most part to a point. When you are talking these kinds o speeds, not really true. There is another problem:

Ram and FSB requirements with a 3.4 GHz overclock:

2.4C
12 x 283 FSB = 3.4 GHz
1:1 ratio = DDR566
5:4 = DDR453

2.6C
13 x 261 = 3.4 GHz
1:1 = DDR523
5:4 = DDR417

Many mobos have problems @ FSB speeds such as 283. A 2.6C keeps the FSB speed at a more manageable level. Also memory quality is tough to deal with. A 2.6C with a 5:4 ratio is a sweet spot. You can still get good ram @ a decent price that will run tight timings @ that DDR speed and have good performance.

Haven't you forgot about the 3:2 ratio...?

This is the way I have it...

CPU @ 290FSB @ 1.5375volts
Memory @ 194Mhz @ 2-2-2-5 @ 2.55volts

 

[solofly]

Originally posted by: batmizang
damn.... makes no sense to me, u have same mobo, same ram, a 2.4c, stock vcore, and ur running faster then me. I have same mobo, same ram, a 2.6c, 5:4 ratio, 1.65vcore, 2.8vdimm, and im doing 3.12ghz....whats ur game accel settings steve? Hell, whats all your settings, and components. Whats ur fsb/ram timings/vdimm/ what kinda heatsink/fan/paste/psu? Maybe i need to start clean with the artic silver ceramique, maybe i put too much on?

Sounds like you have reached the limit of your CPU.

 

[oldfart]

Originally posted by: solofly

Originally posted by: oldfart
True for the most part to a point. When you are talking these kinds o speeds, not really true. There is another problem:

Ram and FSB requirements with a 3.4 GHz overclock:

2.4C
12 x 283 FSB = 3.4 GHz
1:1 ratio = DDR566
5:4 = DDR453

2.6C
13 x 261 = 3.4 GHz
1:1 = DDR523
5:4 = DDR417

Many mobos have problems @ FSB speeds such as 283. A 2.6C keeps the FSB speed at a more manageable level. Also memory quality is tough to deal with. A 2.6C with a 5:4 ratio is a sweet spot. You can still get good ram @ a decent price that will run tight timings @ that DDR speed and have good performance.

Haven't you forgot about 3:2 ratio...?

Yeah, I forgot to put the 3:2 in there. 3:2 ratio will make most ANY memory work with a high FSB speed.

 

[batmang]

werd