Grazie ancora, però ho un piccolo problemino.. Praticamente, arrivato al tab criteri, mi trovo davanti solo le voci
"OTTIMIZZA PER LA RIMOZIONE RAPIDA"
e
"OTTIMIZZA PRESTAZIONI"
che però non posso modificare (hai presente quel grigino tipico di windows?)... Come faccio?
Per quanto riguarda la RAM, non ho toccato il BIOS, non credo ne sarei capace, ho solo modificato con alcuni programmi dei settaggi (Credo del registro)... Ne scrivo alcuni (cmq mi sono sbagliato, non credo proprio che siano tutti settaggi della RAM):
Unload DLLs from memory
Disable pagining executive
IO Page lock limit
Reserve more space for Master File Table
Ah, già che ci sono, il "recovery" della memoria in cosa consisterebbe? Ho paura di aver involontariamente imposto un qualche limite oltre il quale il sistema avrebbe "recoverato" la memoria...
In ogni caso, i danni peggiori credo di averli fatti con TuneXP segnalato in questa guida (con Cacheman, in fondo, ho fatto tutto con molta più cautela... Era il primo prog. di questo tipo che utilizzavo e visto che era andata bene mi sono fidato troppo di TuneXP): http://gear.ign.com/articles/554/554744p5.html
codice:
Memory and File System
# Accelerate DLL Unloading
This will clear DLLs from memory faster than Windows normally does. It's possible that you'll see a small gain in Half-Life 2's performance if you run a bunch of other apps beforehand, but we recommend leaving this off as it'll likely impact general system usage more than it would help you with HL2.
Recommendation: Disabled
# Clear Pagefile on Shutdown
This'll will cause your virtual memory file to be erased when you shutdown. It may make booting and early usage after a boot faster, but it'll make shutting your system down take longer. Use it if you like, but we'll just go ahead and recommend you leave it alone.
Recommendation: Disabled
# Disable Page Executive
This will load some Windows system files into RAM instead popping them into the pagefile (see above.) You'll need at least 512MB of RAM to use this but Windows should respond faster afterwards.
Recommendation: Enabled if you have at least 512MB of RAM
# Faster Shutdown
Half-Life 2 performance won't be impacted, but this is a nice tweak. It shortens the shutdown time allowed for applications which can speed up the shutdown time significantly.
Recommendation: Enabled
# File Allocation Size Tweak
The allocation size for memory files will be tweaked. It should give you a small increase in general usage, though impact on Half-Life 2 may or may not be noticeable.
Recommendation: Enabled
# Optimize Prefetch
Without getting too confusing this tweaks the way Windows pre-loads DLLs. It should give a bit of an overall system performance increase.
Recommendation: Enabled
# Increase NTFS Performance
Every file in Windows has a "Last Accessed" timestamp on it. If you have no need to know this (most people likely don't) then enable this tweak to remove it. Files that are read will no longer have to be timestamped, so disc performance will increase. Half-Life 2 will likely load slightly faster, but since levels will be contained in one big compressed file, this probably won't help HL2 performance much. Still, it's good for your overall system performance.
Recommendation: Enabled
# IO Page Lock Limit
This optimizes the way large programs are handled in RAM. Select which option matches your amount of RAM.
Recommendation: Match RAM size
# Clear Prefetch Folder
We recommend you run this now to clear out some cached files created by Windows. It's probably good to run this every now and then as well, but you'll have to remember to do so.
Recommendation: Use it two to four times a month
# Defrag Boot Files
This tweak will stick the files needed to boot Windows together on the drive, speeding up your bootup time. Not really any Half-Life 2 performance gain here, but it's quite nice.
Recommendation: Enabled
# Disable Zip Folders
If you have your own third-party zip application that handles compressed files, such as WinZip, go ahead and choose this. It will disable Windows' built-in zipping utility which will save you valuable system resources.
Recommendation: Enabled
# Ultra-Fast Booting
This is a two-part tweak that basically combines the Defrag Boot Files option with a disc defragmenter. As it says it'll help boot times which, while nice, won't really help Half-Life 2. Run this one overnight and be happy.
Recommendation: Run Overnight
Hardware
# Enable UDMA-66
As its name says, it'll enable UDMA-66 support for people with those drives. Unless you're only running Serial-ATA drives, go ahead and turn this on.
Recommendation: Enabled
# Increase CPU Priority
This will put a priority on whatever the main task that's running happens to be. It may not help all that much, but enabling this on a low-end system may help a bit. Mid-range to high-end guys probably won't see much of a difference, and it may actually slow things down otherwise. But you low-end guys, try running this while you're playing Half-Life 2 and see if it helps out. You'll want to turn it back off afterwards if you're system is negatively impacted otherwise, though.
Recommendation: Enabled during play for low-end systems
# Increase USB Polling Interval
The USB polling interval is the amount Windows waits to read from a USB device, i.e. possibly your mouse and/or keyboard. Unless you're running on a laptop and want to conserve battery power, leave this off or it may impact mouse response.
Recommendation: Disabled
# Speed-Up Windows IRQ Handling
This tweaks the way Windows deal with the system bus IRQ. We don't really need to explain it, just turn it on and you'll be happy.
Recommendation: Enabled
In effetti mi sento un po' stupido ad aver combinato tutto ciò, ma la voglia di giocare ad Half-Life 2 era grande... 
Scusate per il "papiro"