ATIccelerator II
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Overclock ATI graphics cards.   Free
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ATIccelerator II can change ATI graphics cards frequencies live, on-the-fly, under Mac OS X. It's much more sophisticated and convenient to use than ATIccelerator I for the following reasons:
  • no potentially dangerous flashing required
  • no cumbersome three-steps process (dump, modify, then reflash ROM)
  • no need to reboot for every frequency change
  • no OS 9 required (that's right, G5s and other recent OS 9-free Macs are now supported!)
What's New
Version 1.0.6b:
  • Fixed memory frequency for the 1.5 GHz Mac mini's Radeon 9200.
Requirements
  • PPC
  • Mac OS X 10.3.9
  • ATI graphics card not older than the Rage 128





MacUpdate - ATIccelerator II



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ATIccelerator II User Discussion (Write a Review)
ver. 1.x:
(14)
Your rating: Now say why...
Overall:
(14)

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+2
blarghh commented on 10 May 2008
I do not get this program at all. It seems like a great idea, but the interface is confusing. When I press up on the processor field, once, the percentages go from 0 to -61%, and 0 to 192% respectively. makes no sense to me. maybe it's beyond the scope of my knowledge..
[Version 1.0.6b]


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Splunk23 commented on 28 Oct 2007
Works great for me with my Radeon 9200. I bought a hacked one from eBay that has newer firmware than the one that is installed from the ATI software, basically PC version for Mac and it was permanently over-clocked and so is the RAM on it. By using this little gem, I successfully got rid of all the random little dots on the screen that moved around by lowering the speed of the VRAM by 10%.
[Version 1.0.6b]


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Pecos Pete commented on 28 May 2006
Doesn't play nice with my system, way 2 many screen artifacts & instability even before adjustment. Click on my name to C system specs.

Worked on ATI 7000 but on 9200 useless!
[Version 1.0.6b]


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Anonymous reviewed on 28 Nov 2005
"No one needs to fry anything here. Be sure to check out:..."

Yes, I did. Still, 2 words of caution:

- values that have reportedly worked for others may NOT work for you. I've found a report about a Tibook 400Mhz like mine going OK at 140 percent CPU speed (using ATIcc 102). The same type of machine sitting on my desktop freaks out at speeds higher than 121,43 percent (127,50 Mhz).
When I had set ATIcc CPU value to 140 percent, then right after restart the CPU value showed minus!100 percent, and the respective value in the plist was something in a galactical range that I've simply forgotten it by now. So maybe it's been me stretching things too far. Yet by now I believe that it also might be a problem at least with the current version of ATIcc that it may not always calculate and/or write proper settings to its preference file. -- See also next word of caution...

- While YOU may be cautious about setting the values, ATIcc may not always, at least not the current version. Couple of days ago I've ATIcc'ed an iMac (with Range 128 Pro) using fairly conservative values and without any further experimenting. The machine worked well every day since until this morningafter auto-start it sat there with screen looking like a piece of some sort of computer science art. And again, ATIcc's CPU value stood at minus100 percent and the respective value in the plist file is way higher than I had set it. And I can just *guarantee* that between yesterday and today *no one* has changed *any* system related prefs incl ATIcc's settings. I cannot see it other than that out of the clear blue, ATIcc has messed up it's own pref file.

I love this program. It definitely speeds OS-X on aging machines. It's worth trying it, and I'll even keep using it. By the same token, it also deserves more hard work to improve it's engineering in addition to all the hard work that may have already gone into it. My2cents.
[Version 1.0.6]


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Anonymous reviewed on 22 Nov 2005
No one needs to fry anything here. Be sure to check out:

http://www.atiacc2.mac-fan.com/

_before_ overclocking your ATI card. Look at a bunch of different configurations (%increases) that other people have used, and keep yours on the conservative side of theirs. Try from there. You CAN fry your card if you're putting up high numbers. Some video cards are already overclocked from the factory. For example:

The ATI Radeon 9800XT is an overclocked 9600XT. I can overclock my 9600XT to near 9800XT performance.

unrelated,
Until this update, my 9600XT G5 tower would sometimes would turn my screen into a blathering mess of lines and bright colors, locking up the computer. I'd have to hold the power button for 5 seconds, every time I clicked the 'ATIcellerator' system preference pane, if this happened. It would happen 1/5 times. But I don't click it much, since I have my %'s set.

Great utility. IMO, anyone looking to squeeze some more playability out of some games that would be so much easier to play with just a FEW more fps, or want that GUI to be just a little smoother, this is the utility. It's not going to blow your mind, but you will probably find a noticable improvement is possible. Once again, check out http://www.atiacc2.mac-fan.com/
[Version 1.0.6]

1 Reply

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mswfujowdffyc replied on 09 Dec 2005
Just FYI, 9800XT is an entirely different chipset than the 9600XT, which is actually cheaper to produce (but does tend to overclock better).
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Anonymous reviewed on 21 Nov 2005
Does not seem to work with dual monitors. No matter what I set my radeon 9800 at, I get bad artifacts when playing any 3D game.
[Version 1.0.6]


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Anonymous reviewed on 16 Aug 2005
Great program- I have used it in a variety of computers and never had any problems with it. In my iMac DV with an ati rage pro 128 card, I can get a nearly 50% gpu overclock and run the gpu in sync with the ram (108/108, stock cooling).

One suggestion: it would be useful if the program could be tied in to the energy saver preference panel, so that you could automatically downclock your video card to improve battery performance, and then have it go back to defaults when the power adapter is plugged in.
[Version 1.0.5a]


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Anonymous reviewed on 25 Jun 2005
Beautiful.
[Version 1.0.5a]


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Anonymous reviewed on 17 Jan 2005
Sweet little program. Since updating to OS X 10.3.6 I've been having continual freezes. After much investigation and even system re-installs I tracked the problem down to my display. With this program I've been able to underclock and things are far more stable than they were.
[Version 1.0.5a]


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Anonymous reviewed on 04 Jan 2005
For my radeon 9200 on a a beige g3, it was a matter of being to fast. Thank you for including the ability to underclock my card. Im running at about 82% of stock speed and I appear to have removed my lock ups.
[Version 1.0.5a]


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Downloads:33,599
Version Downloads:16,091
Type:Utilities : Optimizers
License:Free
Date:26 May 2006
Platform:PPC 32 / OS X
Price:Free0.00
Overall (Version 1.x):
Features:
Ease of Use:
Value:
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ATIccelerator II can change ATI graphics cards frequencies live, on-the-fly, under Mac OS X. It's much more sophisticated and convenient to use than ATIccelerator I for the following reasons:
  • no potentially dangerous flashing required
  • no cumbersome three-steps process (dump, modify, then reflash ROM)
  • no need to reboot for every frequency change
  • no OS 9 required (that's right, G5s and other recent OS 9-free Macs are now supported!)


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