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Impressed by A64 2800+ - 700MHz overclock at default 1.5v

eBauer

eBauer

Senior member
No idea what the average overclock is for these, but I was surprised when I hit a 24-hour prime95 stable overclock of 2.5GHz @ 1.5v (board reports 1.45v idle, 1.5v full load)

Chip is retail and came from newegg yesterday. Quite a bit of performance for only $125 🙂
 
Little above average, but very indicative that the newcastles had some room to OC themselves...I think you have a bit left!!!
 
thats realllllly nice. top end processor for 125 bucks. the 2800+ dosn't do dual channel though does it? not that it makes a big difference.
 
Think I might need a new power supply - anything over 1.6v and half the rails become unstable - using a two year old Enermax 431w power supply.

Banshee: as far as other settings, I have 3x HT, 3.0v on the memory. I believe everything else is stock - haven't begun any serious tweaking yet. Any other settings you particularly wanted to know?
 
Can you post the Voltage of your AGP & Chipset? I think my motherboard is undervolting.

Last night i set my chipset to 1.7 and i was able to go to 2400. (it is running Prime95 now so i am not sure if it is stable or not.

Your running Stock cooling too right?
 
AGP and Chipset voltage were left default.

The dfi utility reads the agp @ 1.48v and the chipset @ 1.56.

I'm using a Thermalright XP-120 to cool things 🙂
 
OK, so how did you get that overclock. I am a n00b and have no idea.
Well thats not true. I can do FSB o'clocking, but when it comes to more than
that I have no idea.
Full details please, I have the same CPU so its quite interesting for me.
 
nice I just got a Retail 2800 and it needs 1.65 Volts to hit 2.25 Ghz. This I just got from newegg yesterday....
 
I am extremely pleased with my AMD64 2800+ Newcastle as well, I got to 2.43Ghz, which is 630Mhz, (approx. 35% O/C). I can hit 2.48Ghz prime stable, but anything above 2.5 immediately fails prime.

Settings:
9x270 = 2,430Mhz
166 Memory Divider (DDR 442, 2.8v which is board max)
3x HyperTransport (810Mhz)
Voltage set at 1.5v, but it's reporting at 1.75, It's a motherboard issue and not a PSU issue.

I know that before messing with a divider I was running more Corsair XMS 3200C2 at DDR470, so the RAM shouldn't hold me back. I remain unconvinced that I can't get anything more out of it, so I'm going to go on another O/Cing binge this weekend since I got my new cooling stuff (Zalman 7000Cu, Artic Silver 5, new case fans) and temps have dropped between 3-7 degrees celcius.

Cha0s - How did you hit that? Your sig says a ClawHammer 2800+, I didn't think those existed. What are your settings for memory? HTT? etc?

If anyone else has tips for this chip let me know

All in all a great chip for the value.

Jaimie
 
All the setting were untouched after i put it together (using K8NS F10 by gigabyte). It has an option which says "top performance" i enabled it. and when i boot into windows every program reports as 2794Mhz or 2.8Ghz. CPUid says its running at 11x254 (i dunno, its probably a bug, but i ran prime 95 for ~48hours stable) And also there's a noticeble performance boost. ( i have a sh?t ?ss videocard geforce mx i did fps test it gives ~115 fps with "top performance disabled" and ~180fps with it enabled 😱 50%+ improvement)
I use ghetto memory PC3200. I just need to get a new videocard and i can beat any fx-55 system 🙂
Its an old clawhammer, they dont make those i believe
 
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