Actual performance gain from OCing?

[StealthElephant]

I've just been contemplating what my final plan should be.

I was thinking of going S939 3500 but the price is just so high on those CPUs so I've been looking at S754 again.

The thing is, I've seen people OCing to 2.4+ on air and I was wondering what would give the most performance.

For example

(assuming all S754)

Buy a 2800 64 CPU @ 1.8 and OC to 2.4 compared to buying a 3400 CPU 64 which runs at 2.4 to start.

Would the 2800 OCed perform exactly as well/better than it's 3400 counterpart? Buying a 3400 CPU wouldnt' offer a higher OC ceiling would it? Would it makes sense to simply buy a cheaper CPU and OC to the speed levels of the more expenive CPUs? I've seen alot of people OC 3000/3200 CPUs to 2.4-2.6, how come they didn't buy a 2800 and OC it (difference in the CPUs)?

I'm really not looking to push a CPU as far as it will go, just get it to run fairly fast. I mean, the 3400 AMD 64 is about 290$. The 2800 is about 150$. Would I be able to get performance levels of the 3400 by OCing the 2800? Would OCing require me to buy more expensive ram which would negate the 150$ savings of the 2800?

Would going S939 and OCing the 3500 really give that more more performance over the S754?


I'm new to all this but I'm really interested.

 

[SPEEDingMoNK]

Hello, 'lemme start out by saying im not an expert on OCing at all but i have done my fair share of it. I dont have a socket 754 PC yet (i just ordered the parts tho..)

I could be woung but I dont think your going to get an extra 600Mhz out of a cpu w/ just air cooling. check around on a bounch of OCing sites this one to and see what speed the OCed cpu has stock and the differance bettween that and how far it was pushed w/ air cooling. say its an avrage of an extra 400mhz just add that to the specs. of the CPU you buy and that should give you a good ball park.

Originally posted by: StealthElephant
Would the 2800 OCed perform exactly as well/better than it's 3400 counterpart? Buying a 3400 CPU wouldnt' offer a higher OC ceiling would it?

OCing will push a CPU farther than its saposed to go so IF you OC a 2800 and it reaches a stock 3400 than THEORITCALY OCing a 3400 would reach 4000 (you proble wont be able to push either CPU that far tho)

Originally posted by: StealthElephant
Would it makes sense to simply buy a cheaper CPU and OC to the speed levels of the more expenive CPUs?

Yes.

Originally posted by: StealthElephant
I've seen alot of people OC 3000/3200 CPUs to 2.4-2.6, how come they didn't buy a 2800 and OC it (difference in the CPUs)?

Probly because OCing will only add X amount of mhz therfor OCing a 2800 will not likly reach the same speeds OCing a 3200 would

Originally posted by: StealthElephant
Would OCing require me to buy more expensive ram which would negate the 150$ savings of the 2800?

No, it shouldnt. If you have some Generaic ram you might wanna buy better ram tho...

HTH Remember this is all just to MY knowlage and im not an OCing expert. id get a couple more replys befor takeing action

Peace - |V\oNK

 

[bobsmith1492]

You can't count on OCing to a certain point, first off. Second, an OCd chip is most likely faster than a stock chip of the same speed, esp. with the '64s. Because they are multiplier locked (correct?), you have to increase the FSB and/or HTT, which increases the overall performance more than the higher multiplier in a faster stock chip.

Also, you can't count on the faster stock chips OCing the same amount higher like say a 2800 would. They are based on the same core, but the more expensive ones tested out better so they are set at a higher speed stock. On the old XPs, you could get 2500 bartons that would overclock higher than some of the 3200s (esp with a 2500 mobile). The 64 is a new core though, so I would expect higher overclocks from a more expensive chip for now.

 

[Mullzy]

You should get an oc of 10-20% out of any CPU these days; maybe 25-30% if you're lucky and have exceptional cooling. The big question is deciding what CPU to start with. The newest/fastest/most expensive CPU is rarely, if ever, the best choice. Sure it's 10% faster than anything else on the planet... but usually costs 100% more for that extra 10%.

Your best bet is just to pick the cpu you can afford and then push it as far as it can go. You may never get a 2800 to 3400 speeds... but you'll probably get close enough to be glad you saved the cash.

Good luck regardless!

 

[trexpesto]

Originally posted by: SPEEDingMoNK
Hello, 'lemme start out by saying im not an expert on OCing at all but i have done my fair share of it. I dont have a socket 754 PC yet (i just ordered the parts tho..)

I could be woung but I dont think your going to get an extra 600Mhz out of a cpu w/ just air cooling. check around on a bounch of OCing sites this one to and see what speed the OCed cpu has stock and the differance bettween that and how far it was pushed w/ air cooling. say its an avrage of an extra 400mhz just add that to the specs. of the CPU you buy and that should give you a good ball park.

Socket A 2600+ is rocking right now. Manzelle posted that he got to 2.75GHz on air, next to his AC unit...

Heck my 90$ 35W mobile Barton which is a 1.8GHz chip does 11.5x216 = 2484 stable if I give it 1.775V. That is a 684 OC, and fairly average from a decent stepping.

Check out This Thread 25 days old though. It does talk about A64, if that's your interest

Originally posted by: Zebo
...

Here's how I'd rank the value CPU's right now for overclocking.

1. Moblie XP, $77-$95 not the fastest but still faster than celeron, but with the overclcoks these chips are seeing, insane low price and the NF2 soundstrom mobo's really have to push it to the top.

2. A64 2800+ $140, these newcastles overclock very well and with the new high HTT capable boards like the 250GB at 2.5Ghz will destroy that XP above and just about anything for that matter.

3. CeleronD $120. Good chip it seems from initial clocking results at the right price. And if you believe in intel chipset mythology it's the way to go. If you can get 3800mhz on stock HSF its a phenominal value.

4. TIE ~$170 either a A643000 or a 2.8 P4C. We all know those P4C's are better than thier prescott brothers, shorter pipe, cooler, very fast encoders and renderers.... considering they hit 3.5 all the time, you will have one of the fastest computers at almost anything from a "old" processor. Couple that with some very nice cheap intel 865PE mobos and it's a sweet bargian....The A643000+, same deal as the 2800+ only more money.

And in a respectable 4th place the $45(!) Duron 1.6 @ 2400 EDIT: some say 2300 Plus there is the chancy hardmod to enable extra L2 cache from 64K to 256K (~ like tbred). /RollTheDice Maybe not worth the actual result, but for having fun on a budget and getting into easy hard mods... Edit: note the price of the 1.6 was raised from 43 to 47 (same as 1.8) at newegg this week.

Well you had to go and do it, bring up the duron.. actually the $40 Duron or a T-bred XP for around $55 nothing can touch thier price to performance ratio...So they are number 1... Problem is, even overclcoked, thier barley enough for demanding games out now so I felt obiged to leave it off the list entirly.

 

[StealthElephant]

Well I was looking at the AMD 64 3400+ w/ 1MB L2 cache.

It's already clocked fairly high, so it probably wouldn't go much further right? and costs a good 200$ more then an AMD 64 2800+.

I mean, getting the 3400+ is there really much room to go much higher? If I could get within 85% of the 3400+ by OCing the 2800+ then it would probably be worth it not to spend the extra 200$. But if the 3400+ would OC considerably past the 2800+ then maybe it's worth my money.

Lets say the 2800+ would OC to 3200+ performance wise. Is it likely the 3400+ would OC to the 3600+ performance range? Maybe it would be worth it to get the 3400+ then.

Also, OC is always explained as going from say, 2.0Ghz to 2.6Ghz. But how does the transfer to the AMD value system? Does a 2800+ CPU, which is clocked 1.8 Ghz stock, when you OC the 2800+ to 2.2 Ghz, does it match the 3200+ CPU performance since they are now clocked at the same speed?

What OCing a 3400+ compared to OCing a 3500+ S939. How does that convert?

I'd like to get a CPU that I could OC enough to get a decent performance gain, and not worry about heat. I mean, a 3500+ S939 or 3400+ are already clocked pretty high, so is it going to hit a wall faster? How big of a separation would there be between an OCed 2800+, 3400+, and S939 3500+?

 

[trexpesto]

AMD seems to boost the performance rating when it has a larger cache (compare the two 754 3400's), and also for 939. They must do some tests similar to Sandra..
The answer to the expectable overclocks must be posted already, sorry I don't know. Try a few searches..