Need advice on AM2 CPU

[creaker]

Hi!
Recently I repaired Gigabyte mobo (GA-M52L-S3) and now I have to build a server using it.
I'm planning to use it as Samba server, print server and, possibly, as a box for Transmission client.
The thing is I have two suitable CPU, Phenom X4 9750 (HD9750WCJ4BGH) and Athlon 64 X2 6000+ (ADX6000IAA6CZ).
So, I'm not so familiar with AMD CPU's and I need advice on which one is better for such a box?
Athlon has a higher frequency rate, but has two cores only, and higher power consumption (125W).
On other hand, Phenom is 4 cored and has 95W TDP. Looks better than Athlon, but I heard that the first Phenom was horrible chip.
Though, I've tested them both for a day (with liveCD) and didn't notice any trouble.
As well, I'd like to know, if I will use Phenon and, in future, I will decide to replace it latter, can I simply replace it with Athlon (in terms of march/mtune compatibility)?

Thanks.

[Anon-E-moose]

I would go with the phenom, less power usage and 4 cores.

I'm not sure there is a lot of difference between the 'march' for athlon x2's and the phenom's.
As far as march goes if you set it to k8 then either would work, and for your purposes
I doubt you'll notice any problems with performance.

I think the higher freq will be offset with more (onboard) memory and the extra cores on the phenom.

Bottom line, either one will work for what you want to use it for.
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[Cyker]

If it's going to be a server, go for the Phenom - More cores is better for server work!

[creaker]

OK guys, thanks for replies.
Seems I have to go with Phenom. If so, is "amdfam10" march/mtune suitable for this CPU? I found it's OK for Phenom II, but not sure it will be fine for Phenom as well.

[Anon-E-moose]

[wrc1944]

For Gentoo and all the compiling, I believe more cores equals better performance. Over the years, I've used 2,4,6, and now 8 core amd cpus, and any time I'm emerging all my cores @world (or anything else) all my cores are pegged at 99% usage nearly the entire time. Apparently, portage is very well-threaded, and takes real world advantage of all the cores your cpu has. Amd bulldozer, piledriver, and even steamroller have their problems with single thread, but they are great in the multi-threaded situations, benchmarking right up close to a high-end i7.

Since gcc added support for it, I've always set march=native in make.conf. I've also recently started using the gentoo-sources "experimental" USE flag, as besides other nice stuff, it gives you the gcc options patch for tuning your kernel for your cpu, either with the cpu type name, or selecting "native," which sets a few more options than the actual name (for example instead of enabling piledriver, or athlon, etc., enable native in your kernel config).
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[666threesixes666]

the screwed up phenom chips end in 00 not 50.....

[creaker]

@Anon-E-moose
your command output has -march=amdfam10 option included.
If I'll set march=amdfam10, will not some of the other options are disabled?
May be set it to native is better as wrc1944 suggests?


@666threesixes666
It's OK.

[wrc1944]

To clarify:
When you select the Processor type and features option "Native optimizations autodetected by gcc" in the "make xconfig" window,
the help pane underneath shows: