Overclocking (Main Thread)

But wait a second, what is the actual motivation behind overclocking a processor in the first place? If you're doing it just to squeeze out more performance for gaming, then honestly, there isn't much to worry about—you should be able to run any title without a hitch
. If your ultimate goal is to push a CPU up to that 4GHz mark, why let concerns about longevity or system strain weigh on your mind?
Even if we assume that overclocking might shorten the component's lifespan, wouldn't you likely be looking to upgrade to a newer, faster processor by the time that happens anyway?😁

So, how much could I actually push this CPU to 4 GHz using this cooler? Say I’m running it 24/7—which, let's be real, isn't happening—but maybe 4 hours a day at most?

Mark Sanchez3 said:How much could I push this CPU to 4 GHz using this cooler? Say it runs 24/7—which it won't, maybe just 4 hours a day at most.

You'll get at least five years out of it if you have a decent chip. Honestly, you have nothing to worry about, especially if you stick to stock voltage.

Arthur Martin9 said:Can someone tell me if I can overclock my Intel Pentium + Celeron? It's currently running at 1.9GHz, but could I push it to maybe 2.2GHz? I've got 5 fans in the case. Temps in macOS are sitting at 36 degrees, but in the BIOS, they hover between 24-27.

I'm using a GA-K8NS motherboard
with an Intel Chipset

By default, it runs at 1.6GHz.

When I go into the BIOS under Voltage Control,
- I see this option:
CPU OverClock in MHz 200—it's actually sitting at 238 right now.

Well, you've already bumped it up by nearly 20%.
No clue how much higher you can go. Did you try pushing it and hit a wall, or did you just stop there?

Back when I had an Intel Core 2 Duo on that same chipset, I remember hitting about a 25% limit. Same deal happened with my Venice 3700+ on an nForce4.

It all depends on the processor. I'd bet the motherboard can handle more.
If you can set the AGP and memory to run asynchronously, then they won't hold you back.

Look, I’m not exactly an expert when it comes to overclocking CPUs, locking down memory timings, or messing with the AGP port... I did read somewhere that someone actually managed to push this processor up to 2.4GHz, but honestly, I don't know—I'm a bit hesitant about whether I should risk breaking something or, heaven forbid, actually fry the chip or something like that..

The main issue is that I can't get past 238 in the BIOS while overclocking before the whole system just crashes. Maybe I should try bumping up the voltage? I’m really out of my depth with how voltage actually works—it's my first time even considering it... If only it were like overclocking graphics cards where you just tweak the max memory or GPU clock by maybe 5-10% and call it a day. I think my cooling setup is decent enough, but who knows what kind of headroom I actually have since I haven't pushed it past its current 1.9GHz limit..

Just wanted to toss in a few extra details

LGA 775 for Intel Core 2 processors
1600MHz system bus
Capable of supporting core frequencies well beyond an Intel Pentium + Celeron—it's quite fast

Arthur Martin9 said:I guess I don't know much about overclocking CPUs, locking memory, or the AGP port... I read somewhere that someone actually pushed this processor to 2.4GHz—not that I'm an expert—but I'm a bit worried about messing things up or maybe even burning something out...

Basically, I can't get past 238 in the BIOS when I try to overclock before the system crashes. Maybe I should bump up the voltage? I'm not really sure how that works exactly—it's my first time—if it were more like graphics cards where you just tweak the memory or GPU by 5-10% and call it a day. My cooling seems fine, though I'm not certain... I haven't pushed past 1.9GHz, which is what I'm running at right now.

First off, you have to figure out what's actually holding you back—the CPU, the RAM, or the chipset. There isn't much point in cranking up the CPU voltage if the RAM is the bottleneck, or vice versa.

And how exactly am I supposed to go about checking that?

Arthur Martin9 said:So how am I supposed to check that?

Keep all your other components at low, basic settings—kind of like an underclock—then crank just that one setting up to see where the breaking point is.

I think you should dig into your BIOS and see if you can lock the AGP speed (basically, making sure the AGP bus doesn't scale up automatically with the system speed).
Also, check if there are any memory ratios set. If they are, stick to the lowest possible speed while you're stress testing the CPU and motherboard.
For testing the board itself, drop the CPU multiplier to a lower number and then push the bus speed to see how far it actually goes.

ADVANCED BIOS FEATURES

Hard Disk Boot Priority
First Boot
Second
Third
Boot Up floppy Seek (Disabled)
Display Settings (AGP) PCI

INTEGRATED PERIPHERALS

IDE Function Setup
On-Chip Primary PCI IDE (ENABLE)
On-Chip Secondary PCI IDE (ENABLE)
On-Chip LAN (nVidia) Auto
On-Chip LAN BOOT ROM (Disabled)
USB Host Controller (V1.1+V2.0)
USB Keyboard Support (DISABLED)
USB Mouse Support (Disabled)
Serial ATA 2 (Internal PHY) ENABLE
AC97 AUTO
Onboard Serial Port 1 (3F8/IRQ4)
Onboard Serial Port 2 (2F8/IRQ3)
Onboard Parallel Port (378/IRQ7)
Parallel Port Mode (SPP)
ECO Mode Use DMA 3 (locked - I can't touch this one)
IDE DMA transfer (ENABLE)

POWER MANAGEMENT SETUP

ACPI Suspend Type (S1(POS))
Soft-off by PWR-BTTN (instant-off)
PME Event Wake Up (Disabled)
Modem Ring On (Disabled)
S3 Resume by USB device (Disabled)
Resume by Alarm (Disabled)
Power On by Mouse (Disabled)
Power On by Keyboard (Disabled)
AC BACK Function (Soft-off)

PnP/PCI Conf.
PCI 3 IRQ Assignment (auto)
PCI 4 IRQ Assignment (auto)
PCI 1/5 IRQ Assignment (auto)
PCI 2 IRQ Assignment (auto)

PCI 3 IRQ ASSIGNMENT
AUTO-assign IRQ to PCI 3 (default value)
3,4,5,7,9,10,11,12,14,15 set IRQ 3-15 to PCI 3
It's the same for these other three—I have no clue what they actually do.
PC HEALTH STATUS

Vcore OK
DDR25V OK
+3.3V OK
+12V OK
CPU WARNING TEMP- (currently at 60 degrees)
CPU FAN Fail Warning enable
System Fan fail warning enable

When I head over to the Frequency/Voltage Control section in the BIOS...
-I see these options:
CPU Overclock in MHz: 200 is default, but right now I've got it sitting at 238.
AGP Overclock in MHz: 66 is the default.
K8 CPU Clock Ratio Default
VDDQ (AGP) Voltage Control Normal
DDR voltage control Normal

The motherboard manual claims I can push the CPU Overclock anywhere from 200MHz up to 455MHz.

K8 CPU CLOCK RATIO
x4 800MHz - x10 2000MHz

CPU Voltage
Normal
+5%
+7.5%
+10%

VDDQ (AGP) Voltage Control
Normal
+0.1v
+0.2v
+0.3v

DDR Voltage control
Normal
+0.1v
+0.2v

Look, I'm no genius, so what should I actually do here? For instance, if I bump the CPU up to 250, will the system even boot? I'm worried about frying something or just ending up with no video signal at all. I know you can sometimes overclock a PC to a frequency where it won't start, forcing you to flash the BIOS or something, but my board doesn't have a jumper near it for that... So, I don't know, would pulling the CMOS battery work? Any advice would be appreciated. Thanks.

How much overclocking headroom am I actually looking at with this setup?
- CPU: Intel Core 2 Duo E8500 3.16GHz
- Motherboard: Intel Motherboard
- Case: Antec Sonata III, just running a single 120mm fan🤔

And keep in mind, I'm sticking with the stock CPU cooler. No fancy aftermarket heatsinks here.

Scott Wood84 said:How much can I overclock this CPU?
- CPU: Intel Core 2 Duo E8500 3.16GHz
- Motherboard: Intel Motherboard
- Case: Antec Sonata III, one 120mm fan🤔

No aftermarket cooler on the CPU.

I've got one. It can take a lot.
I have no idea what kind of board you're running. Does it even support overclocking?
If you're actually serious about pushing clocks, you're going to need a decent cooler.
I managed to hit just over 4600.

Oh, it wouldn't just be a little tweak—I’d be pushing that thing all the way up to about 3.6GHz. 🤷

Scott Wood84, I think you might have just a bit too much time on your hands lately... why don't you just go out and buy some gear, start overclocking, and then come back and let us all know what kind of scores you hit!

Arthur Martin9 said:A
well, I'm clearly out of my depth here—what should I even do? If I jump straight to 250 for the CPU, will the system even boot? I'm worried about frying something or just getting a black screen. I know you can set a frequency where the PC hangs and then you're stuck needing to flash the BIOS, but I don't see a jumper next to it on the motherboard... maybe I could just pull the battery? Any advice? Thanks

It doesn't work like that—you don't just jump to 250 immediately. The default is 200. You start there and climb slowly, a few MHz at a time, testing as you go. If it crashes during a test, you might bump the voltage slightly, but you have to watch the temperatures. Overclocking is tedious—it takes a while if you actually want to do it right. It isn't just "click and go." To hit the max or even just find an optimum, depending on what you're after, it can take days of constant tweaking and stability testing.

And honestly, before you really dive in—read more and learn the basics. It seems like you aren't quite familiar with things like resetting the CMOS or flashing a BIOS...
So, yeah—theory first, practice later.

Roger Wright94 said:I’ve actually got one sitting right here, and man, it can really pull its weight.
I’m not entirely sure what kind of motherboard you’re running, though—does it even have any decent overclocking headroom?
If you’re planning on getting serious about pushing those clocks, you’re definitely going to want to pick up a beefier cooler to handle the heat.
I managed to push mine just north of 4600.

I was wondering how far you could get while staying at the stock voltage? I'm also curious if you had to bump up the Voltage Control at all to hit that 4 GHz mark...
From what I've been reading online, it doesn't seem worth the effort to push past 4 GHz if you're looking for actual performance gains—it's more of a "look what I can do" thing for bragging rights, but hey, if that's your goal, go nuts!

Bryan Sanchez86, thanks for the advice 🙂 I’ll give it a shot on the Intel Chipset, though I have a feeling it won't hold up—meaning it probably won't even make it to the macOS desktop 🙂

You didn't quite get me—you don't just jump straight to 250. You start somewhere around 205... maybe 207... 210... 212... and so on. Once you hit the point where it won't boot into macOS, then you bump up the Voltage Control a bit. Just a little, though. Then you try again. I guess you have to raise the Front Side Bus in tiny increments, since you don't really know where your limit is. When you finally hit the wall—where it won't go any higher even with more voltage, or if things start getting too hot—that's when you stop, back off the Front Side Bus a little, and call it a day.
You can use Prime95 for a quick check, but for a real stability test, you should run Prime95 for at least a few hours before claiming your OC is actually stable. Because even if you can get into macOS, that doesn't necessarily mean the system is solid.

I ran Orthos at 4GHz for about 3 hours and everything was totally fine, but then I switched over to OCCT and it crashed after only 10 minutes!

ruggedotter10 said:What voltage were you running at stock? And how much did you have to bump it up (if you even had to) once you pushed it to 4 GHz?
I keep reading that pushing past 4 GHz isn't worth it if you actually care about performance. If it's just for bragging rights, then sure, go nuts.

Man, you're asking a lot. At stock voltage, you can usually squeeze an extra few hundred MHz out of the FSB—maybe 300 or 400.
Here’s what I know for sure based on my own logs; this is how I bumped it up:
1.3 V - FSB 400 MHz
1.4 V - FSB 440
1.5 V - FSB 480
That's a rough estimate. Since I was chasing a high FSB number, I basically just scaled the CPU voltage up ahead of time as I went.
I hit 4 GHz using somewhere around 1.3 V, maybe a tiny bit more.

I managed to push it to 4610 MHz. I'm just a fraction of a second away from breaking into the sub-10 range on Prime95. I'll get back to it when I feel like messing around again.

So, what's the deal with it not being worth going over 4? You think it's because of the voltage requirements or just diminishing returns?
I just checked Speccy. I'm at 4200 MHz with 1.4 V. Honestly, I could probably dial it back a tiny bit, but I don't really lose sleep over it.