X2 3800+ or 4200+

[MeatLoaf]

Is the 4200+ worth the extra over the 3800+? Im assuming the 4200+ has a higher multi so will help my clocking efforts.

And how would a 3800+ or a 4200+ compare to my present SD3700+ at 2.7Ghz?

 

[oweneades]

I personally sould save you money and get the 3800+ (like what I did).

Mine clocks fine to 2.4ghz on stock volts, although there is plenty left (I havn't tried for higher yet).

AS for a comparison to a single core; I used to have a 4000+ clocked to 2.6ghz and I havn't noticed any performance difference in games compared to my X2 3800+ at 2.2ghz.

However running multiple apps at once is much faster on the X2 than it was on the 4000+. You still get the egg timer but its much less apparent.

 

[ajgoodfellow]

I'd personally go for the X2 3800+ too. The multiplier is nice but the 4200+ doesn't clock any better and you're not benefiting from the extra cache like on the 4400+

I'd personally get an Opteron 165 or 170 and clock that. These are good clockers and they have the extra cache

For the X2 3800+ to perform like your 3700+ in single threaded applications you'll need to clock it to about 2.8/2.9GHz to make up for the fact it's got half the cache

In multi-threaded apps though the X2 3800+ will be faster, even at it's stock 2GHz

 

[MeatLoaf]

Well spotted, i hadnt noticed that the 3800+ only has 512K cache.

If i had on opty 165 i know i can push my HTT up to 267Mhz as thats what i did on my old winnie 3000+ to give 2.45Ghz.

 

[ajgoodfellow]

With an HTT of 267 you should get 2.4GHz out of the 165 - it's got a 9x multiplier. You'll get 2.67GHz out of the 170 due to the 10x multiplier

Your board should go higher than 267 with a decent clocking CPU though

 

[MeatLoaf]

267 was as far as i could get the old winnie to go to and the most i can get out of the 3700+ im using now is 245, it crashes at anythinf more

 

[ajgoodfellow]

Have you tried dropping the ram to a low divider and the HT to 3X?

A good way to test the limit on the HTT speed on your motherboard is to reduce the CPU on your multiplier to something like 6x and then increase the HTT. This way you're not overclocking your CPU (just the HTT speed) so this removes a possible limiting factor

Sometimes boards will clock higher on different memory dividers, regardless of the memory used

 

[oweneades]

For the X2 3800+ to perform like your 3700+ in single threaded applications you'll need to clock it to about 2.8/2.9GHz to make up for the fact it's got half the cache

eh? I havn't noticed any performance loss from my 4000+ clocked at 2.6ghz compared to my 3800+ originally at 2.2ghz.

The extra cache adds 5% max to the performance difference (if that). A 3500+ with 512k cache performs nearly identically to a 3700+ with 1mb cache.

 

[MeatLoaf]

Have you tried dropping the ram to a low divider and the HT to 3X?

A good way to test the limit on the HTT speed on your motherboard is to reduce the CPU on your multiplier to something like 6x and then increase the HTT. This way you're not overclocking your CPU (just the HTT speed) so this removes a possible limiting factor

Sometimes boards will clock higher on different memory dividers, regardless of the memory used

No i havent tried that yet, i know the HTT is good up to 267 and the RAM is good for that speed to when using a 166Mhz divider. More volts dosent seem to help either. With 1.5v it only goes to 2.75Ghz so id rather run at 2.7 on stock volts.

 

[sablabra]

For the X2 3800+ to perform like your 3700+ in single threaded applications you'll need to clock it to about 2.8/2.9GHz to make up for the fact it's got half the cache

Hah, ******** of the day. You mean half the cache makes a difference of 700mhz? I like you, your funny

 

[ajgoodfellow]

If you read the original post his San Diego is at 2.7GHz so I adjusted accordingly

 

[oweneades]

If you read the original post his San Diego is at 2.7GHz so I adjusted accordingly

Didn't notice that when you posted that mate!

You are totally correct however at those clocks. Although it does depend heavily on the application.

 

[Booner!]

Well spotted, i hadnt noticed that the 3800+ only has 512K cache.

If i had on opty 165 i know i can push my HTT up to 267Mhz as thats what i did on my old winnie 3000+ to give 2.45Ghz.

The Cache is actually 1MB ... the Dual core gives 512 x2 = 1MB

but yeh i am in the same position and might go X2 or Opty 165

 

[sablabra]

The Cache is actually 1MB ... the Dual core gives 512 x2 = 1MB

but yeh i am in the same position and might go X2 or Opty 165

yeah but it would be the same as 512kb since it's only 512kb per core...

But 512kb extra cache could propably justify 100mhz