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Everyone Tell Me Their Highest 1045t Thuban Overclock - Page 2

post #11 of 73
1.55 is awfully risky on a Thuban, although you can get away with it on a Deneb. I don't recommend higher than 1.45 on a Thuban.

Thubans are actually "Istanbul" core Opterons that were modified to run on AM3, and the silicon they're made from has an additional dielectric layer that isn't there on a Deneb. Because of this difference in the manufacturing, they are not as tolerant of high voltage as a Deneb is (but also don't need the same voltage to reach the same clocks). I've seen people run Denebs at 1.7 with watercooling and get by with it, but you'd be nuts to do that to a Thuban.
     
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post #12 of 73
Quote:
Originally Posted by jsc1973 View Post

1.55 is awfully risky on a Thuban, although you can get away with it on a Deneb. I don't recommend higher than 1.45 on a Thuban.
Thubans are actually "Istanbul" core Opterons that were modified to run on AM3, and the silicon they're made from has an additional dielectric layer that isn't there on a Deneb. Because of this difference in the manufacturing, they are not as tolerant of high voltage as a Deneb is (but also don't need the same voltage to reach the same clocks). I've seen people run Denebs at 1.7 with watercooling and get by with it, but you'd be nuts to do that to a Thuban.

The Max for Thubans is 1.55V, and so with the CPU-NB, that's if you can provide the cooling off course, Anything higher, and you would be seeing some sort of degradeation soon.
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post #13 of 73
Quote:
Originally Posted by jsc1973 View Post

1.55 is awfully risky on a Thuban, although you can get away with it on a Deneb. I don't recommend higher than 1.45 on a Thuban.
Thubans are actually "Istanbul" core Opterons that were modified to run on AM3, and the silicon they're made from has an additional dielectric layer that isn't there on a Deneb. Because of this difference in the manufacturing, they are not as tolerant of high voltage as a Deneb is (but also don't need the same voltage to reach the same clocks). I've seen people run Denebs at 1.7 with watercooling and get by with it, but you'd be nuts to do that to a Thuban.

Interrrresting!

I recently suffered a bout of Buyer's Madness and impulsively plonked for a 1045T to replace my 555BE. rolleyes.gif

My Mobo is the dreaded MSI 870A-G54 Fukushima Special. frown.giffrown.gif

When buying the X6, I knew the Mobo wasn't an OC monster, and never planned to gun for 4G+. After the chip arrived, I gave the subject a bit more thought and research and discovered - OH JOY! - just how fragile the G54's VRM actually is.

So.... until I can either replace the MOSFETS with lower Rds-on resistance units, and/or find a good way to cool them, I'm going to be very tentative with OC. Voltages will remain stock, and I'll slowly push the core and NB clocks, monitoring MOSFET temps with the trusty finger poke.

The chip's default V is 1.325 and that's where it's going to stay for now. NB is 1.15v

After only a few hours of playing around with the system:
With a slightly wimpy 60mm fan blowing air over the VRM area, I'm up to 3.3GHz - stone stable - without signs of thermal stress from any of the components. This should be ~115W. Under various burn/test program loads, the mosfets are definitely warm+ to the touch, but they not yet what I'd consider to be 'hot' or painful. The threshold of pain is supposed to be around 55C / 130F, maybe a little higher for something so small. When I get there, I'll stop. I'm not running any apps that will saturate 6 cores, so I'm not too worried about running ~3.3+ in the short term.

In the end, I'll probably wind up replacing the NIKOS P0603BDG junk with one of the Infineon offerings available on DigiKey. While the chips are off, I'm thinking of soldering a ~1mm thick copper strip, bent in a flat bottomed L or maybe U shape, to the mobo pads, and then soldering the MOSFET to the copper. The ascending strip(s) will blow in the wind and should cool the pad fairly effectively. (I'm not at all convinced that cooling the top of the MOSFET case will do much for the critical junction temps.) Has anyone on this forum ever tried such a hack?

When/If this project gets off the ground, I'll open a new thread and will attempt to document the mod's effectiveness.
I'd like to be able to run fully loaded at 3.5~3.7 GHz without killing anything. If JSC is right, anything above ~1.4v will probably make more heat than it's worth.
Edited by Geonerd - 11/17/12 at 11:53pm
post #14 of 73
I have mine running stable 3.6GHZ @ 1.275v with a hyper 212+, it never goes past 53c. This is on a ASUS M5A78L-M LX Plus board.
post #15 of 73
Quote:
Originally Posted by 69mustang View Post

I have mine running stable 3.6GHZ @ 1.275v with a hyper 212+, it never goes past 53c. This is on a ASUS M5A78L-M LX Plus board.

Wow! thumb.gif
post #16 of 73
Quote:
Originally Posted by 69mustang View Post

I have mine running stable 3.6GHZ @ 1.275v with a hyper 212+, it never goes past 53c. This is on a ASUS M5A78L-M LX Plus board.

That is impressive for that mobo, maybe it isn't as bad as I though?
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post #17 of 73
If I push anymore than 3.6GHZ the mobo starts to downclock during prime/linx testing. I am guessing the VRM's are getting too hot. At 3.6GHZ I don't have any issues, even after 50 linx loops while running prime95. Also Bus speed is 267MHZ and HT Link is 2403MHZ.
Edited by 69mustang - 11/18/12 at 12:09am
post #18 of 73
I can't get past 3.8ghz, maybe its motherboard limitation

Here's mine, running on it 24/7 stable.

http://valid.canardpc.com/2588095
post #19 of 73
Quote:
Originally Posted by s0nniez View Post

I can't get past 3.8ghz, maybe its motherboard limitation
Here's mine, running on it 24/7 stable.
http://valid.canardpc.com/2588095

Dayum! thumb.gif
That is a niiiice OC.
    
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post #20 of 73
Hey everyone!
My name's Ed and I'm new here. I thought I would join in on this topic. I have a 1045t overclocked to 3.8Ghz, specs here:


This summer I've become OBSESSED with overclocking. I noticed doing a slight increase to 3.2Ghz make this CPU dramatically better in the FPS department. After 200+ hours of experimenting, upgrading the cooler to a Coolermaster Hyper 212 Evo, I was able to hit 3.8Ghz with relatively low temps as well as keeping the system 110% stable.

BUT... I crave more! I don't know if anyone goes to it, but there's an overclock records site "hwbot" it's called. I've seen people hit around 4.3Ghz with the AMD 1045t Thuban (in fact one person hit 4.8Ghz on liquid cooling and another on liquid nitrogen). I don't have my rigs specs in but right now I have 1333Mhz RAM, I just upgraded my mobo to an awesome Gigabyte 990UFX3 and tomorrow I have 16GB of 1866Mhz overclockable GSkills RAM coming in the mail.

I think the RAM makes a difference - because the 1045t is overclocked via the FSB, RAM definitely plays a roll in getting it faster. Right now I'm 110% stuck at 3.8Ghz, my computer/cpu will NOT go past that at the moment and I think the RAM is one of the main things. I also ordered a XSPC Raystorm 360 water cooling kit I'm installing later this month to keep this thing cooler at the higher speeds. Right now at max load in Prime 95, this CPU gets scorching at around 69 C, it's TDP is 75 C. I'm aiming for a 4.5Ghz overclock on this CPU if it's the last thing I do! Let's just hope the apocalypse isn't real before hand! tongue.gif Lastly I've read around about some people turning off the extra cores (so it's only a quad core similar to the 965 black edition). I didn't have success in that department and from the records made with this chip, you do NOT need to disable two cores.

I'm going to play around with the RAM, install the water cooler after Christmas, and I (promise) I will come back here and post my results. This site is pretty cool, I've read/learned alot on here finally registered. Making some huge cosmetic changes as well, bought a Phantom NZXT full tower case and SLI'ed my grafix already.
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