Overclocking your X1800XT

Using ATI Tool

Now your voltages are correct. It's time to OC, but first, some info about temperatures. If you havn't noticed already, there are a lot of readings that ATi Tool reads from the X1K series cards. There are five different readings, to be exact.

What do they mean? In order from the first reading to the last..

  1. Voltage Regulation. This temperature monitors the VREG area. This is near the rear of the card, around the long pink/red heatsink. Try to keep this under 75ºC. You can lower temps by placing a 120MM fan at the rear of the card.
  2. Core Draw (Amps). This tells you how much power your core is drawing. X1K's draw a crap load of power, so expect this to be quite high at times.
  3. Fan Speed. This tells you how fast (in percent) your fan is going.
  4. Core Temp. This is your X1K's core temperature. Make sure this does not exceed 80ºC at any time.
  5. Ambient Temp. This is the temperature of the air around the video card. The sensor is located towards the front of the card, by the DVI plugs.
Now that you have proper understanding of the temperature readings, it's finally time to overclock.

Note: Do not adjust the sliders when the 3D View, or Artifact Scanner is open. It will most likely lock up your computer.

Simply adjust the bars to your liking. Drag them up 10-15MHz at a time, and open 3D View for about 2 minutes to test general stability. Fire up CS Source, or another game you like to play. If it doesn't freeze within 20-40 minutes, you're all set! These cards are very sensitive, and they WILL lock up if you OC too high.

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Those are my stable clocks on this Zalman VF700-Cu. I'm sure I could go higher, but there really is no need at the moment. Note that these cards draw an outstanding amount of power. Single rail (+12v) PSU's are preferred with X1K cards, in most cases. If you have a dual rail PSU and your card is unstable even at stock, investigate a bit. Check both of your +12v RAILS with a Digital Multi-Meter. You can get a DMM at your local Radio Shack for $19.99. If your rails sag a noticeable amount (under 11.80v) under load, you either need to adjust your rails via pots if your unit has them, or you will need a new PSU.

If you're lucky enough to have a Tagan PSU with a switch on the back, to select either a single 12v rail or dual 12v rails, slide it over to a single 12v rail.

Here are my voltages (idle, 0.03v less compared to my DMM)..

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(Click to view full image)

Per normal, always take caution when overclocking. Please take note, that these cards have been known to lock up and send the monitor into standby mode when the core is pushed too high with too little voltage. So, if you're OC'ing and your computer freezes, then your monitor goes into standby mode... do not fret. Just press the reset button on your case and you'll be back up as soon as your computer boots up again.

To have ATi Tool apply these settings at startup, please read the next page.

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Most Recent Comments

05-04-2006, 19:09:51

OK Nick, spill the beans I've downloaded atitool, but whenever i get it to auto detect max clocks, i get a corrupted screen.If i increase the speeds manually, it works fine, and i can also increase the voltages to push it further (not sure whats a safe max violtage tho - any ideas?)I've read that its quite easy to flash to an x1800xt pe, but whenever i try and do anything at all near the bios the screen just corrupts on me I dont think the card is faulty or anything tho as it plays games 100% ok.Quote

05-04-2006, 19:20:57


05-04-2006, 19:35:28

First, go into MS config and disable the things in taht thread, and also cli.exe

Also, DO NOT use auto clocks, it screws everything up w/X1K cards.

Try 650/750. Play CS for 30 minutes. Also


1.35v core

2.097v ram, those are stock 3d volts.


06-04-2006, 04:39:07

I've disabled all the things you said, and it now allows me to OC, but any ideas why i cant backup/flash (either atiwinflash or atiflash) the bios on the card without it corrupting the screen?

Edit: One last thing, in every overclocking tool i use it says my core is 600mhz, when its supposed to be 625.Quote

06-04-2006, 11:58:06

you get the beta atitool mate?Quote

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