Observations with an FX-8350

[Vesku]

Perhaps this is one of the reasons for high default voltage on the 125W 8300s, http://techreport.com/news/24111/rumor-95w-amd-fx-8300-due-later-this-week

Hoarding all the lower leakage units for a 95W SKU.


Sidenote: CMT seems to be the one area of the BD design that hit expected targets. Before Bulldozer launched I was expecting 6.4 x roughly Nehalem cores, I had no reason to expect the individual cores to have actually taken a step backwards in performance. At this point I would guess Steamroller might come close to this initial expectation or slightly exceed it, assuming a non-APU 4-5 module version is eventually released. Although at this point I think AMD will be better served focusing on getting decent results out of their APUs in terms of HSA and perf/power. That is if focusing more effort would give better results which is no sure thing with AMD unfortunately.

 

[guskline]

IDC: Have you done any OCing with the 8350 yet?

 

[Idontcare]

Perhaps this is one of the reasons for high default voltage on the 125W 8300s, http://techreport.com/news/24111/rumor-95w-amd-fx-8300-due-later-this-week

Hoarding all the lower leakage units for a 95W SKU.


Sidenote: CMT seems to be the one area of the BD design that hit expected targets.

I agree on both counts. That does go some distance to explaining the 8350's penchance for the amps, and CMT really did hit it mark when it comes to the performance tax from shared resources.

IDC: Have you done any OCing with the 8350 yet?

I have briefly dabbled, taking my chip to 4.8GHz for some CPUmark99 tests.

Then I got sidetracked into tackling the CR1 vs CR2 situation with my ram, failed at that but it was a good learning curve to climb.

Now I want to look into OC'ing the CPUNB.

Any pointers on max voltages to put into the CPUNB?

 

[inf64]

@ IDC

Don't try to push CPUNB voltage at first. Try and see where you land with stock voltage, frequency wise. Then when you hit a stability wall(should be 2.6Ghz if I'm not mistaken) you can start scaling up the voltage. Be gentle there though since the chip can be sensitive to big jumps. In a few workloads the NB/L3 OC can up the performance by a couple of %s,not too bad. The price is as always, heat/power.

 

[itsmydamnation]

HTT and clock make the biggest difference. there isn't much perf above 1600mhz in memory clock. NB clock seems to do almost nothing, same with HT. I haven't tested to see if 1600mhz with lower timings makes a difference but right now im running 2133 @ somewhere around 1600mhz ( cant check without going into bios) i couldn't get my memory to run @ 2133 at all but i didn't try very hard.

find your highest clock based on just multi, then find your highest HTT with a low multi, then raise your multi to get aprox the same speed as your highest clock.

i was able to get to 4.8 with +0.05 volts with 30mins of IBT on my 8350 i bought a few days ago. I can get to 4.6 with -0.15 ( its high1.2v) with 30mins of IBT. My only problem is i cant monitor anything because the box is running ESXi.

in IBT @4600 with 200/23 HTT/multi i get 35/36 GFLOPS in a win 7 SP1 guest, with 230/20 HTT/multi i get 43/44 GFLOPS


edit: in ESXi guest @4600 i get 536 which matches your graph, i guess everything is in L1/L2

 

[bgt]

My FX8350 does:
Power consumption:
idle: 43W
prime 95: 220W (2500K does 130W)
Very happy with the setup. It replaced my 2500K setup. It(2500K) got a bit slow in the end.

Some hardware specs:
housing: Nexus Prominent R
CPU cooler: Actic Freezer 30(replaced the Artic cooler with the Nexus D12SL-12-BW)
case fans: Nexus D12SL-12-BW 2off
PSU: Be-Quiet 350W
The Prominent R is a very, very quiet case. The Nexus fans are the quietest I could find.
All the fans are controlled with the 'speedfan" program.
The motherboard has a load of controlled fan headers so to get this setup quiet was easy.

 

[grimpr]

My FX8350 does:
Power consumption:
idle: 43W
prime 95: 220W
Very happy with the setup. It replaced my 2500K setup. It(2500K) got a bit slow in the end.

I bet the 8350 smoked the 2500 in heavy multithreading and multitasking.

 

[bgt]

I bet the 8350 smoked the 2500 in heavy multithreading and multitasking.

Up till now the FX8350 walks all over the 2500K in any single/multiple application I use. Replaced it 2 weeks ago.

Its a very cool machine. When loading Prime 95 it gets to a max of 62C staying very quiet. This chip is very fast. Comparing some simple tasks with my 2500K setup shows how fast it is. It flies through files/iso/zipetc using winrar. Maybe it uses a bit more energy but eh.......it is like a fast car...you can only smile

 

[inf64]

Cool looking system! Did you OC it or you run stock?

 

[grimpr]

Cool build, congratulations! Its a beast!

 

[bgt]

Thanx, its a nice system. No, did not OC it yet. Need a bit more time.

 

[SPBHM]

My FX8350 does:
Power consumption:
idle: 43W
prime 95: 220W (2500K does 130W)
Very happy with the setup. It replaced my 2500K setup. It(2500K) got a bit slow in the end.

I'm sorry but, slow for what? it's faster than the 8350 for many applications, and even if you overclock to 4.5GHz it's probably going to use less power

 

[jvroig]

Any pointers on max voltages to put into the CPUNB?

I believe it follows the same range as the vcore. It was true for Thuban and Deneb (AMD "recommended" [with lavish disclaimers and hand-washing about warranty] the same 1.35-1.5V range for high-end aircooling for both vcore and cpu-nb v), it's at least within the realm of likelihood for BD and PD as well (without official specs from AMD, we can only guess). It contributes a great deal of heat as well, I remember getting as much as 4-6C higher temps when I overvolted and overclocked the CPU-NB. (Thuban, 1.3v CPU-NB, 2.7GHz, off the top of my head; I had the same experience with the Deneb, but at a much lower clock, it could only barely do 2.6)

 

[bgt]

I'm sorry but, slow for what? it's faster than the 8350 for many applications, and even if you overclock to 4.5GHz it's probably going to use less power

My 2500K would not overclock to 4.5Ghz. It was too hot also. Had to buy a big cooler to cool it. Still got over 65C when fully loaded. Wanted to buy an i7 3770 but HT is a weak point of Intel. I have a 3225, 2100,2100T here for use in HTPC's but I find HT to be very chaotic in use. Sometimes it really acts like a dual cpu and in another instance it is a quad core. So for me a true core is better.

 

[Makaveli]

My 2500K would not overclock to 4.5Ghz. It was too hot also. Had to buy a big cooler to cool it. Still got over 65C when fully loaded. Wanted to buy an i7 3770 but HT is a weak point of Intel. I have a 3225, 2100,2100T here for use in HTPC's but I find HT to be very chaotic in use. Sometimes it really acts like a dual cpu and in another instance it is a quad core. So for me a true core is better.

From the pic you post above you have a huge cooler on the amd chip so how is that listed as a negative?

How is Hyperthreading chaotic when in a chip that its used in htpc which in general means light use and not heavy threaded applications?

What software are you running on this HTPC?

And for IDC I have a question for you.

Normally on intel chips when they are full loaded and hyperthreading is on it still give the system a certain smoothness when trying to use other applications at the same time under load. In the same situation do you find under full load that multitasking takes a hit on Bulldozer/Piledriver ?

 

[bgt]

I had an Arctic Freezer 13 on the 2500K. That was a bit smaller then the 30. Had a smaller housing also(Fractal1000). The HTPC was used for a lot of unzipping/downloading work over several files. And the 8350 has no problem doing other tasks when you have prime95 on at the same time(using 8 threads). I have the 2500K pc next to my 8350 pc. So its easy to compare(use 1 of them every other day).

 

[Makaveli]

I had an Arctic Freezer 13 on the 2500K. That was a bit smaller then the 30. Had a smaller housing also(Fractal1000). The HTPC was used for a lot of unzipping/downloading work over several files. And the 8350 has no problem doing other tasks when you have prime95 on at the same time(using 8 threads). I have the 2500K pc next to my 8350 pc. So its easy to compare(use 1 of them every other day).

The second part of my question was more about hyperthreading and a 2500k doesn't have it. That is the reason I directed it to idc I know he has a 2600k in his list of systems.

 

[SPBHM]

My 2500K would not overclock to 4.5Ghz. It was too hot also. Had to buy a big cooler to cool it. Still got over 65C when fully loaded. Wanted to buy an i7 3770 but HT is a weak point of Intel. I have a 3225, 2100,2100T here for use in HTPC's but I find HT to be very chaotic in use. Sometimes it really acts like a dual cpu and in another instance it is a quad core. So for me a true core is better.

what about 4.3, 4.4GHz?

as for temp, why exactly do you need 65º?
also, are you using the same sensor to compare CPUs? I think the power usage is a much better indication,

also I don't really follow your experience with HT, the i7 have a much higher single core performance, so even with the lower gain coming from HT compared to CMT or another independent core, it can keep up with the 8350 on the worst cases, while using less power and generating less heat, while given the same power limitations probably even the i5 (without HT) can do that, and when it comes to ST there is really no competition...
I fail to see the 2500K as anything close to slow compared to the FX

 

[grimpr]

I had an Arctic Freezer 13 on the 2500K. That was a bit smaller then the 30. Had a smaller housing also(Fractal1000). The HTPC was used for a lot of unzipping/downloading work over several files. And the 8350 has no problem doing other tasks when you have prime95 on at the same time(using 8 threads). I have the 2500K pc next to my 8350 pc. So its easy to compare(use 1 of them every other day).

I agree 100%, its a multitasking monster and behaves exactly like a Core i7 at heavy multithreading, the quadcore 2500k has nothing on it, it chokes. I run mine with Turbo Core at 4.4ghz and its an awesome experience.

 

[JimPhreak]

The 3770k (for $229 at MC) spits all over the FX-8350.

 

[grimpr]

The 3770k (for $229 at MC) spits all over the FX-8350.

Thats good for the US of A and MC stores, rest of the world is 100$ more, so try to be pragmatic and landed.

 

[JimPhreak]

Thats good for the US of A and MC stores, rest of the world is 100$ more, so try to be pragmatic and landed.

Wait you mean there are places other than the US of A? :hmm:

 

[grimpr]

Wait you mean there are places other than the US of A? :hmm:

Yes, try Google Earth.

 

[JimPhreak]

Yes, try Google Earth.

Haha kidding of course. However there have been many selling 3770K's NIB for $250 on different forums so it's definitely doable for those outside the US.

 

[Abwx]

The 3770k (for $229 at MC) spits all over the FX-8350.

Not with really highly threaded workloads...

Just registered to troll a little..?..