Tbred 1700 Overclocking -- Need feedback and input

[porkbun]

Hello everyone,

My Tbred 1700 is currently running at 10.5*166 (1750 MHz) at 1.75 V (as reported by A7V333-R). Temp can go up to 61 C (HOT!) at full load (Prime95 torture test for couple hours). HSF is volcano 6 Cu+ (6800 rpm, I know this is not a good HSF). Memory is Kingston 256 PC2100 DDR I just got from OD (no idea who made it, currently running at ~2.7V).

I would like to push it across the 1800 MHz line. What should I do now? Should I just increase the voltage and see if it will run at 1833 MHz (something probably will start melting)? Or should I forget it and be happy with 1750? I think my stepping starts with an R.

What do you guys think?

 

[AkumaX]

nice o/c! i think the heatsink dept needs a lil tinkering

 

[Necrolezbeast]

or you could get a 1600+ to that same oc like me....I have a volcano2 and have yet to see temps over 58c when case is at 43c

 

[porkbun]

I can't agree more. At 1.75 V and 1750 MHz, the new 1700 and the old 1600 dissipate approximately the same amount of heat (~80W, estimated using GORK's OC Tools). The heat flux from the CPU to the HSF is way higher for the new 1700 due to its smaller area. To sustain that flux, the thermal gradient must be larger too (assuming that the HSF's temp is fairly constant for both cases [will lead to underestimation]), and that's why the chip runs hotter.

 

[CaptainHilts]

That cpu temp. seems kind of high, I assume that is the internal cpu temp. and not just the surface cpu temp.?

How long have you had the cpu, and what kind of thermal paste are you using between the heatsink and cpu? I'm using the retail fan and heatsink with some arctic silver, and it took about five days before I could get my maximum overclock (at a given voltage anyway). Right now I am running it at 1.8GHz (180x10) with a vcore of 1.825. The vcore is quite a bit above the default of 1.5v but if you consider that the higher speed Tbreds default at 1.65v this is not too far over spec. (at least this is how I rationalize it to myself). Surface temp. is 46C full load and cpu internal temp. is around 10C more than that.

If your cpu is brand new I would give it another day or two and then try edging up the fsb a bit (if your memory can handle it or if your board allows you to lock the memory at 166), or even bump up the multipier to 11 if you're feeling ambitious. FYI I have to go from 1.725v to 1.875v if I want to make the jump from 166x10.5 to 166x11 (I wasn't really comfortable with the vcore that high, that's why I settled inbetween with 180x10).

166x10.5 is still pretty good though, 2200+ performance out of a 1700+.

 

[porkbun]

Originally posted by: CaptainHilts
That cpu temp. seems kind of high, I assume that is the internal cpu temp. and not just the surface cpu temp.?

How long have you had the cpu, and what kind of thermal paste are you using between the heatsink and cpu? I'm using the retail fan and heatsink with some arctic silver, and it took about five days before I could get my maximum overclock (at a given voltage anyway). Right now I am running it at 1.8GHz (180x10) with a vcore of 1.825. The vcore is quite a bit above the default of 1.5v but if you consider that the higher speed Tbreds default at 1.65v this is not too far over spec. (at least this is how I rationalize it to myself). Surface temp. is 46C full load and cpu internal temp. is around 10C more than that.

That's the internal temperature, which is about 5 degrees higher than what you have. I have arctic silver, and the CPU is only 2 days old. I think, with the HSF I have now, I should not crank it up any higher. Maybe I will leave the case open, but the Delta fan will definitely severely annoy me. The case temp is on the high side because I have two 10,000-rpm drives. Case temp could be as high as 45 C (not steady state yet, as it will take a long time to reach that). After all, my case sucks. It's some cheapo case $20 shipped from egay.

 

[CaptainHilts]

I've got a crappier HS and Fan than you do so you might be able to squeeze a bit more out of it. I only have one 7200rpm drive though, and I cut a big hole in the side of the case and mounted a 120mm fan, so that probably makes some difference.

Anyway at the very least try lowering the voltage a bit in a couple of days and see if it can run stable that way. In the first couple of days it wasn't completely stable at 1750MHz with a vcore of 1.75v. Now I can run it 100% stable at that speed with a vcore of 1.725.

 

[pepsimanz]

I have a tbred xp1700 (Axxxx Stepping) on a epox 8k5a2+ and I was able to OC to 1.83 (11x166) @ 1.725v.

running stable @ about 33C load (non-diode temp) and no prob with prime95 for over 23-24hrs.

I have a thermaltake SLK-800 HS with a thermalright smart case fan 2 running about half throttle (~2700rpm). one intake 80mm NMB 25CfM/22dba fan, and one 120mm vantec stealth van running @ 7V. Using a 300w Sparkle PS with two Seagate HD raid0, Sony 16x dvd rom, Pioneer 104 DVD-R, and two cathode lights.

I also have a xp1600 AROIA with a SVC GC68, but that wouldn't go above 1.7ghz, not sure if it's my chip or the cooler.

However, I couldn't get it to boot to windows @ 11.5x166 (1.92) until about 1.85v and full throttle on my smart fan, and the temp rised to about 40C. Ran prime95 for 1/2 hour with no problem yet, but didn't bother testing further since the high volt and temp and the fan is just too loud @ 70cfm (4600rpm)

Please note again that my temp is from the in-socket sensor, not the from the on-diode sensor, and I think it is about 5-10C lower than actual temp.

 

[porkbun]

After burning in for almost half a day, the core has dropped to 53 C. Still, at 1.75 V, I am unable to boot into Windows @ 1833 MHz. I will not crank it up until I have found a good deal on some good cooling gear. I will, in the meantime, get some more case fans. I am happy with 1750 MHz, anyway. 1833 would be a bonus. If I do not get it, it is not a big deal.

 

[dew042]

Originally posted by: porkbun
After burning in for almost half a day, the Vcore has dropped to 53 C. Still, at 1.75 V, I am unable to boot into Windows @ 1833 MHz. I will not crank it up until I have found a good deal on some good cooling gear. I will, in the meantime, get some more case fans. I am happy with 1750 MHz, anyway. 1833 would be a bonus. If I do not get it, it is not a big deal.

mine maxes at 1.8ghz with wcing.

btw: vcore is actually your cpu voltage... in your case 1.75v

these tbreds are extremely hard to cool.

intel is tempting me.

dew.