OC'd great, now I cant do it again?!?!

[TheProfiler]

I OC'd my CPU today, pushing it from 2000 to 2300 MHz, I lowered memory from667 to 533, set HT link to 800 (1000 is the max) and multiplier to 9.
Everything worked awesome (temp. around 50 degrees, got 600 extra 3DMarks06, wow). Then I tried to push it a little further and it didn't work so I've set it back to my first OC settings and now they don't work.
WTF?!? I did it once. Highest I can go now is 2.15 GHz.
Nothing burned, everything works fine but when I try to put Bus over 220 (2.15 GHz) I fail to boot.
Seems it's memory thing. Least I got that feeling.
Anyone has any advices? I don't understand why I cant go to my previous 2.3GHy settings, I've set up BIOS exactly like the first time.
Now I gained around 7% but it isn't enough.
Any advices, folks?

 

[Poxal]

What memory are you running? With 800Mhz ram these are my settings for 2.4g...
mem div set to 667
Multi 10x
ht x4 (800)
Stock voltage

This runs my ram right at 800Mhz and my ht link around 970Mhz. Stable as a rock!

 

[TheProfiler]

What memory are you running? With 800Mhz ram these are my settings for 2.4g...
mem div set to 667
Multi 10x
ht x4 (800)
Stock voltage

This runs my ram right at 800Mhz and my ht link around 970Mhz. Stable as a rock!

My settings for 2.3GHz:
multiplier:9x
Bus:250
HT link: 800
Memory: 533 mhz (default:667)
Stock voltage

With these I get ht link running around 970, memory 660 and cpu at 2300 MHz.
Perfect. But I just can't aply them anymore...