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opty 165 or x2 3800

Last response: in CPUs
October 5, 2006 5:39:09 PM

newegg lists the opty 165 at $15 cheaper than the x2 3800. the differnce between them is:

opty 165:
HT: 1000
operating frequency: 1.8
L2 cache: 2x 1MB

x2 3800:
HT: 2000
operating frequency: 2.0
L2 cache: 2x 512MB

so my question is which should i get? I wasnt sure if HT made that big of a differnce. have the 165's always just had a 1000 HT compared to the 2000HT of the 3800's?

More about : opty 165 3800

October 5, 2006 6:25:25 PM

I would (and did) go for the opty. Here are the reasons:

1)The extra L2 cache is really nice
2)an HT over 1000 doesn't impact performance (someone correct me if I'm wrong)
3)If you're into overclocking, the optys used to be great (I don't know if the new ones are). Even if the aren't great anymore, it should be easy to get it up to 2.0Ghz if you want.

I'm assuming that you are on a very limited budget and don't want to change anything but the processor but are still interested in entering the world of dual core. If you have a fairly high budget, the C2D's blow the optys and the X2s out of the water. However, that would entail a substantial upgrade.
October 5, 2006 6:38:10 PM

Thanks for the info. greatly appricated. I will get the opty if/when i sell my old proc. Thanks again :D 
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October 5, 2006 9:21:52 PM

I'd experiment with the Opetron if planning to overclock, otherwise, the extra 200 MHz of the X2 3800+ is really healthier than the 512M L2/core of the opetron.
October 5, 2006 10:20:57 PM

the opty 165 in made to run 24/7 in a server, the x2 3800 is for 4 to 9 hours a day at home or in a office. the 165 may be better if you are going to overclock, the x2 3800 would be better for general use. I beleve you would have a hard time telling them apart just by watching. both are good cpu.
October 5, 2006 11:10:58 PM

HTT is same...Choose the Opty. Only bad thing is low multiplier meaning higher HTT needed meaning a good OC'ing motherboard. Shoudn't matter, just mentioning..

October 6, 2006 3:23:18 AM

ok i have another question, should i get the opty dual core 165($160) or the single core fx 55($140)...i have no experience over clocking although i would like to just a little bit.
October 6, 2006 12:03:31 PM

ok i have another question, should i get the opty dual core 165($160) or the single core fx 55($140)...i have no experience over clocking although i would like to just a little bit.

Operton Defenately!. The overclocking Is much more enjoyable in the Dual Core Opteron range and It's a Dual Core Opteron Comeon!!, Before the Core 2 Duo This Opteron 165 Was "De facto" CPU of Overclocking, many people had theirs Overclocked to around @2.8Ghz-3.1Ghz[on Par with FX-60(dual-core) range on Air Cooling only!
October 6, 2006 2:12:51 PM

This sounds really promising. do you think that mysetup chould do about 2.6? i have a off brand 350w PS. I have tried clocking my ram to the reccomended settings but was unsuccessful in getting windows to be stable. i've never been able to OC a cpu but maybe that was due to my ignorance.
October 6, 2006 3:57:26 PM

The system is the one in your signature, I assume?

Maybe. 2.6 would be good, but I'm worried about the PSU. 350W off-brand is not very good...Going from a 3500+ to an OC'ed Dual-Core Opty will put a good bit of watts on. An upgrade might be in order. Sadly, many people neglect the PSU while OC'ing and end up with it dying and taking a few of your parts with it (Guilty).

October 6, 2006 9:42:29 PM

If you are lucky, you may hit 2.6Ghz with a 288HTT....

Yup, Wusy is correct. 2.5Ghz on an Opty is almost being mean. DFI's are good, you could go as far as to say DFI's are built for Opterons. Of course, Opterons could be built for DFI's, but I'm getting ambitious.

The new parts list is getting longer. First the CPU, then the PSU, now maybe the motherboard....

Overclocking is something that needs to be thought of before building, to get OC-Ready parts, so to speak. You should be able to pull 2.6Ghz, I think.

October 6, 2006 9:55:19 PM

Hey, Logainofhades, noticed your rig's specs.
I'm impressed you got your Winchester to dependably do 2.5 ghz.
I could never get mine to do more than 2.2 ghz on my MSI board.

Merid, mind if I ask what you're hoping to accomplish?
I upgraded in February from a 3000+ to an X2 3800+ and while I was pleased with it at the time, some eight months later I'm beginning to feel more and more than dual core was way over-hyped. It helps Windows run more stable (I had few crashes before, none in eight months since I changed the CPU) and multi-tasking is improved, but otherwise it kind of seems like a gyp now.

Just sayin'.
October 6, 2006 9:59:35 PM

You've installed the XP Dual-Core Hotfixas well as the X2 Patch?

If not, do those first.

Dual-Cores will only help with multi-tasking. Try encoding some files or run a virus scan. Try using your computer. There might a slight slow-down, but it should seem as though you weren't running another program..

October 6, 2006 11:24:08 PM

Yeah, I followed the advice of others on this post and I have the XP hotfixes installed, the X2 patch, the latest bios from MSI for the motherboard, and I installed something from the AMD homepage too, I seem to recall.
All of which did good things, yeah.
The problem isn't my X2, the problem is that I was expecting something more miraculous than the reality, I think.
That's why I'm cautioning others -- don't expect anything super impression from the upgrade to dual core.
Still, no shutdowns, BSOD or other freaky Windows behavior in 8 months is worth the price of dual core, I guess. I just wish I had waited a few months! I paid over $320 for mine in February. :( 
At current prices, either of those choices listed by the OP would be worth the price of admission to dual core -- especially if he gets one of the really good Opterons that overclocks high.
October 7, 2006 12:25:10 AM

His 350W generic PSU is fine. As long as the fan doesn't fail.

Maybe I've been gone too long.

PSU fan?

Maybe I'm more accustomed to high-end hardware (not saying that is a slow machine, not at all), but can a 350W reliably power that? Especially an off-brand?

October 7, 2006 12:27:28 AM


The problem isn't my X2, the problem is that I was expecting something more miraculous than the reality, I think.

I know what you mean, I felt it was a bit more zippy, but with more than one program open, I felt blown away. Maybe because I've been using a P4 2.8Ghz for too long..

October 7, 2006 3:09:25 AM

kill the troll, kill the troll
October 7, 2006 8:43:58 PM

Overheating,got it....Thanks!

Wusy: I love the guide. I don't mean to brag, but I find myself already following a few. Yup: I disregard a review if it doesn't have OC potential. Makes the reviews fricking useless. I don't care about the bundle or fan or accessories: Newegg can give me that much!


P.S. What is up with all the bumps??
October 7, 2006 9:36:34 PM

Yeah. I think some guys here go a liitle over the top with PSUs

I run A64 3500+ (stock), X1800XT (689/782), 2 hard disks and an optical drive off of a 400W power supply with no problems at all.
October 8, 2006 4:46:47 PM

Ok i now have a 600w ultra powersupply (my other one was a 350w norwood). Is this a good PS? i've heard they aren't as good as they sound. my 12v rail flux between 11.91 and 12.5 is this acceptable? I was wanting to go to at least 2.2 maybe more depending. my ram timings are at 2.5 3 5 3 is this good? i wasnt stable at 2 3 7 3
October 8, 2006 5:39:32 PM

AMD 3500+
MSI K8N Neo-2
Cosair XMS 3200 2x512
Kingston HyperX 2x256Mb
x800XT PE
1x160 Gig Sata
Thermaltake Tsunami

Oh. You already purchased a PSU? That was quick....

If it is made by Ultra and is 600W, you should be great.

Those voltages are from which PS? New or old? They are a little high, though...

Which cooler are you using? Stock?

Hmm...Are you using both brands of memory, like at the same time? One of them might be stopping you, not sure. I'd go conservative if you want to keep all four sticks. Hit up to CAS3. What HTT settings are you using? What voltages?

October 8, 2006 10:03:27 PM

well i took out the 2x256 sticks. those voltages are from the new PSU, which i had already i just didnt have the time/ didnt feel like tearing my rig apart to put it in. my motherboard reported the 12v fluxing between 11.91 - 12.5. i dont have the opty yet but i plan to run the stock cooler. with just the 2x512 sticks what should i be able to go to at what voltages. right now the mobo regulates the voltage because i wasnt sure what to put it at.
October 9, 2006 1:20:45 AM

Hmm...Go slow. Put a divider on the memory (hard to explain in one post, try looking for what they are and how to use them). Up the HTT a few Mhz at a time. Test. Keep doing this until it fails. Up the voltage on the PROCESSOR some, very little. Like 1.35--->1.38. Then go in even smaller increments. Don't try to push 1.5+ on the stock cooler. Actually, don't go higher than 1.475. Monitor temperatures at all times. Don't say, "I'm only at 210Mhz! I'll just skip testing this time." This is how people make mistakes, by cutting-corners. This is why OC'ing has such a bad name at other "conservative" forums. This is how processors die.

Good luck!


P.S. The 12V voltage is different from the processor voltage. You CANNOT change those voltages, only the voltages supplied to parts, like the memory voltage or CPU voltage, heck, even the fan voltage.
October 9, 2006 3:20:54 AM

Now there is a steal. Espcialy when you consider that its closest eival in the X2 lineup is the 4400 which runs only 200mhz faster but costs about $26 for a boxed version. (thats something to consider when your a teenager without a steady income.)

But seriously though i want to go from my single core 3700 to a dual core (has to have 2x1mb cache otherwise i will feel like i am downgrading). So opteron 170 and OC 200mhz or 300mhz or shell out the extra $26 for the 4400. Seriously i dont feel like spending a ton of money on upgrading my PC but i want to get a dual core with 2mb cahce for my socket 939 while they are still easy to find.

I found that my system can easily pull a 350mhz OC with my current proc by switching my mem timings from 2-3-2-5 to 2-3-3-5 (or was it 2-3-3-6. cant remember right this second).


AMD 3700
Asus A8N-E
7800gt @ 450/1150
1 160gig SATA HD
1 250gig SATA HD
2 gigs Patriot mem (SPD 2-3-2-5)
480watt Antec NeoPower
SB Audigy 2.

I think i am only drawing around 300 watts right now (may be even less) so power supply is not an issue.

Sorry for OP about hijacking this thread but i really didnt want to start a new thread asking almost the same question.
October 10, 2006 4:36:45 PM


Now there is a steal. Espcialy when you consider that its closest eival in the X2 lineup is the 4400 which runs only 200mhz faster but costs about $26 for a boxed version. (thats something to consider when your a teenager without a steady income.)

so why would you spend $290 for a chip that is only 200mhz faster than the 165 which is $170? more than $100 less? why dont you get the 165 and hop it up to 2.0 then you can say i got a 290 chip for over $100 less?