The resistor mod will only work for 33Mhz as far as i know.
Soft475 also changes the ram timings which might not be properly configured with only the resistor mod for 40MHz.
Overclock LC475/P475/Q605 without soldering or spicy-o-clock
- Thread starter Mustermann
- Start date
Soft475 also changes the ram timings which might not be properly configured with only the resistor mod for 40MHz.
Continuing my experiments with Soft475, I installed an 88916 onto my other LC475 logic board, intentionally picking one with a different/newer date code. Despite using the same L88M CPU as before, the results are a bit better: I can actually set 50MHz and it works. However, it is unstable. It runs for a few minutes, exhibiting graphical glitches (specifically font rendering, oddly) then crashes.
I will try adding more cooling to the CPU, and see if that helps.
This has helped. With a fan pointed at the heatsink, the CPU stays cool and runs stable @50MHz. Once I take the fan away, the heatsink gets hotter and hotter - and then the artifacts begin.
I tried my original LC475 board again. I had previously reported this:
It would hard lock immediately every time 50MHz was selected.
With a fan pointed at the CPU, it now works and runs without issue.
So it seems that both my boards will do 50MHz.
It would hard lock immediately every time 50MHz was selected.
With a fan pointed at the CPU, it now works and runs without issue.
So it seems that both my boards will do 50MHz.
Last edited:
Where can I find this datasheet?
Were you using the control strip? It's more stable than the Control Panel and tends to have fewer graphics glitches at the limit, but JDW keeps pushing everyone towards the Control Panel, I think just because it has more buttons.
More Buttons <> Better
Edit - I see in an older post that you are using the Control Strip. In which case it might be worth finding some faster VRAM.
Time for a peltier cooler and 60MHz! (If you do, make sure you protect the board from the condensation).See post #165 above
There is also a resistor R13 that it might be worth tweaking the value of - it's on PClk and technically should be tuned for your frequency. While we have values for 20, 25, 33 and 40, sadly they can't be trivially extrapolated because there seems to be an inflection. I haven't experimented with R13 yet.
It does when you tweak itYour Control Strip doesn’t go that high
Similar threads
