Some days ago i managed to overclock my mini a bit (333 MHz), now it works perfectly fine @ 1.833 GHz
The system behaves totally fine, no strange things.

Memtest:
Allocated memory at 0x21C1CB80 -> 0x5C8F89FF, 986562176 bytes
Writing 0x00000000... 815 MB/sec.
Verifying 0x00000000... 387 MB/sec.
Writing 0xFFFFFFFF... 816 MB/sec.
Verifying 0xFFFFFFFF... 387 MB/sec.
Memory is ok!

dnet:
[Jan 04 22:44:57 UTC] Automatic processor type detection found
a PowerPC 7447A (G4) processor.
[Jan 04 22:44:57 UTC] OGR-NG: using core #1 (KOGE 3.1 Hybrid).
[Jan 04 22:45:18 UTC] OGR-NG: Benchmark for core #1 (KOGE 3.1 Hybrid)
0.00:00:17.07 [39,143,192 nodes/sec]
[Jan 04 22:45:18 UTC] RC5-72: using core #4 (KKS 7450).
[Jan 04 22:45:37 UTC] RC5-72: Benchmark for core #4 (KKS 7450)
0.00:00:16.82 [19,566,940 keys/sec]

766 points at Peacekeeper browser benchmark with OWB 1.6.1 @ 1440x900.

What do you snail's say about this:lol:


[ Edited by dake on 2010/1/5 11:23 ]

Totaly unnesesary power boost, my 1,5 Ghz flyes alredy

neat! how's the fan holding up? Mine spins hard under loads on the cpu
(streaming video ect)

My 1.4 flies with morphos as is. No need to risk the hardware. I wouldn't overclock the mini because hot air could be a serious problem.

@Dake

Could you please, tell use how did you that, exactly?

Im interested too.

theres a guide on Obligement for overclocking.

I used this guide: http://www.lbodnar.dsl.pipex.com/macmini/

I posted about it to amiga.org.

[ Edited by Piru on 2010/1/5 18:28 ]

First I want to say that i wouldn't do this on my PegII, the mini's is cheap and i had a spare mini to play with.
And yes this is totaly unnesesary power boost but i couldnt resist:)
I read at some place that if you overclock you will suffer from constant fan sound:
This was not true, the fan in 1.5GHz and in the 1.83GHz is at the same speed at normal system use, only if i start dnet client and run 100% cpu the fan is making more noise on the 1.83GHz. I can understand if the fan make more noise on an OS-X mini because the computer always work a lot, but on MorphOS the system is very idle and so is the fan:)
@xyphoid have you cleaned the cpu cooler? I had to clean all my 4 minis from dust and it make a HUGE difference.
@_ThEcRoW there will maybe be some heat problem if I run dnet (cpu@100%) 24/7 I don't now, but I will not use this beast for such thing.
@FrankBrana "http://www.hardmac.com/news/2005/05/12/overclock-a-mac-mini-1-67-ghz" and
"http://www.applefritter.com/node/10820"
You should not do it without magnifying glass, a steady hand, luck and a very small soldering-iron. I did it without all this things except luck and managed to do it anyway:)
My mini was at 1.5GHz that means that all the four resistors where missing, I had to shortcut R362 and R355, then i had to remove resistor R52, this one is located beneath the heatsink.
After this i put some new thermal grease between the heatsink and processor and also between the thermal pad and graphic processor.
I hold my breath, thumb and started the bastard and everything went ok.
I dont want to brag or anything, i have worked a lot with electronics and this is very very very tiny things, you should think more than once before doing anything stupid like this.

A screendump showing my system details.
http://home.swipnet.se/~w-160129/pics/overclock.jpg

I would only attempt this if the outcome was worth the effort, in short if mame speed improved on (killer instinct, crusin' usa) how about flash streaming on h.q flv-4 (or is this related to internet connection)

God, it's damn cold over there : -22 :D nice shot anyway

16Bit screen looks sad. Dithering all over the place :(.

Cold? yea, later we had -27. Today it's summer only -12
About the dithering, I use many screens and my mini only register 32 of 64Mb:(.

I fail to see any dithering on that screen. What I see is the classic artifact of "colour bands" in the gradient of the backdrop picture. Which, in fact, could be eased a lot WITH dithering: An ancient technique which consists in creating patterns of, say, two colours, in order to acheve an otherwise unavailable third colour. There's a page at Wikipedia with excellent explanations about it.
But it could be also because of a poorly compressed JPEG image. I bet there's no more than 65536 colours in that screenshot. Back in the Amiga ECS days, with so much limitations, we were used to achieve almos incredible results with dithering, even done by hand, pixel by pixel (also antialiasing).

@jcmarcos Yes you right, dithering is totaly wrong word.
And yes my Ambient is running @ 65536 colours in this screenshot


[ Edited by dake on 2010/1/7 16:23 ]

Quote:

Sure? I remember ADPro having a function to count colours... And also another to reduce colour use, applying dithering (with a great Floyd-Steinberg algorythm). That way we were able to have good looking 32 colour images, out of 24 bit pictures... Or course, the original images didn't use those 16 million colors at all, only a few hundred. I was also told that the human eye can only tell about four million colours.
Of course, applying JPEG compression afterwards would totally destroy dithering, so another, non destructive compression should be used. Good old (and lame) "CmpByteRun1" (RLE), as ILBM has, should work, but I don't know if it accepts 16 bit images.
Does PNG have any non-destructive compression algorythm? Or a "100%" quality setting for JPEG? All in all...

...respect the pixel!

By now I'm completely off-topic...

@jcmarcos
Did you notice also that my overclock.jpg actually is a wrong named PNG file:lol:

> my mini only register 32 of 64Mb:(.

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=6560&forum=11#67736

> Does PNG have any non-destructive compression algorythm?

PNG is lossless by definition.

> Or a "100%" quality setting for JPEG?

JPEG is alway lossy because of DCT, even with "100% quality".

Dake: Can you tell me what resistors you have to remove or put in? I'm going to overclock my Mini but by the specialist, I don't feel comfortable enough to do that by myself.

My 1.25ghz Powermac G4 OC to 1.5 runs very well, it actually runs cooler due to a glitch in fan control that keeps it from adequately cooling it a 1.25 due to temperature control/rpm not being synced very well. I think when I get a 1.42 dual card, I'll try and OC this one to 1.67 and keep it as a spare, My 1.42 will probably be running at either 1.67 or 1.83? 5 will get that good copper heatsink too.

@pampers
If you read my earlier posts you will get all info and links, the description I gave is only valid if you have a 1.5GHz model for other models just follow the links and read carefully.
Good luck!

Quote:

So u didn't put any resistors at all? Just connected them together?

@pampers
To avoid confusing: I did not make a shortcut between R362 and R355.
Instead of using a resistor I just put some soldering-iron where the R362 should be located, same thing with R355.

Dake: that's what i meant previously, sorry for that.