AMD FX-8320 not perfoming correctly

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BroDubun

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I'm finding that my FX-8320 (clocked at 5ghz stable) is getting really weird performance in CPU intensive games. It's under performing by a fair margin. All the benchmarks I've looked up for it show much higher FPS in game then I'm getting (even ones clocked at stock speeds). I can barely hold 25 FPS in GTAV. My system performs beautifully in graphically demanding games but severally struggles in CPU demanding titles. My question is, can anyone explain to me why I'm getting less then stock performance even though I have a large stable overclock?

-note: It performs the same when not overclocked and I have used multiple programs to check frequency. I even tried updating my motherboard BIOS with no effect.

-note: I have the system hooked up to a UPS constanty if that means anything.

System Specs:

CPU: FX-8320@5Ghz | 1.4750v | Idle: 20C | Load:40C
Cooler: Corsair H100i V2 | Quiet Fan Profile
Case: DIY PC Red Cuboid
PSU: EVGA 750w | 80+ Bronze | Modular
GPU: RX 480 8GB | Reference Card | Overclocked to 1350 on Core 2200 on memory
RAM: 32 GB | 1600Mhz
MB: Gigabyte GA-78LMT Rev. 6.0 | Newest BIOS

Thank you and any and all advice would be great!
 
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There's more to a motherboard than the chipset, however in this case, the 7xx series chipsets were not designed with FX CPUs in mind, and as such, you should not expect a board based on an older chipset to fully implement some of the newer features such as the socket being able to deliver the increased current capacity, LLC changes, higher frequency VID line, and new (at the point it was introduced) power gating of the FX...
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Supernova1138

Supernova1138

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Drop the overclock on the CPU, your board has weak VRMs and is only barely capable of running the FX 8320 at stock speeds at the best of times. An overclock to 5GHz isn't going to happen without constant throttling back to 1.4GHz as the VRMs are overheating. You need a much better motherboard to overclock your CPU.
 
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BroDubun

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It doesn't throttle at all I've checked it runs perfectly the VRMs only reach 46C
 
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BroDubun

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A CyberPower 530 Watt UPS but my system never passes 400 watts.

 
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maxalge

maxalge

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are you using amd overdrive to check if cpu is throttling?
 
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BroDubun

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I've used that, and HW monitor
 
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James Mason

James Mason

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What if you plug it straight into the wall/power strip/surge protector?

 
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BroDubun

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Same performance
 
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Supernova1138

Supernova1138

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Are you actually monitoring clockspeed while gaming? If it's constantly bouncing between 1.4 and 5.0 GHz you have VRM throttling. VRM temperature is something most boards don't offer sensors for, so any temperature value you see for that is likely erroneous. Point is, it's highly unlikely you're staying at 5.0GHz constant on that board, it doesn't have the power delivery for it, even if you got a golden sample chip that can hold 5.0GHz at a low voltage.
 
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ezskills

ezskills

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The FX cpu's will run better on a 990 fx chip set the chip set you have the 760G was never built to handle any FX cpu without a bios update the 760G chip set will run a Fx cpu but the 990 chip set was made to handle the fx cpu so I think no matter how stable or cool your over clock is the 760G chip set is holding it back.
 
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mjslakeridge

mjslakeridge

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Supernova is right about the motherboard. It is a very low end board. I got that exact board for free from Microcenter when I bought my FX 6300 when they first came out. I keep my FX 6300 at stock speed and don't have any issues, but I don't use my rig for gaming, just internet browsing, watching dvds/recorded tv, etc. When I ran the Passmark performance test on my rig, I got about 1/2 the score of others with the FX 6300 and was told it was due to the motherboard.

Edit: And I did the BIOS upgrade that ezskills referred to.
 
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BroDubun

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I used an IR thermometer well gaming and used an external PC to log the temps. And yes I am monitoring the clock speed. But if you didn't see the note in my original ask I said I still get the same terrible performance when running stock. Thats the main reason I am confused.
 
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BroDubun

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Would that limit my CPU performance in general or just overclocking? because I still get bad performance with stock speeds.

 
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Supernova1138

Supernova1138

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Your board is marginal at best for running the 8320 at stock speeds without undervolting your CPU. The fact you're using a closed loop liquid cooler means you have no air blowing down onto the VRMs which makes the situation worse. When you run a CPU demanding title, you demand more out of the CPU, and your board's power delivery can't keep up with the CPU's power demands, causing throttling. Realistically, the 125 Watt CPUs shouldn't even be on the CPU support list for any of the 760G chipset boards, but board manufacturers keep it on there because under ideal conditions with a top down blower CPU cooler the chip might work okay at stock speeds.
 
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BroDubun

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I do have fans blowing in the VRMs, and thanks for the insight. Even when I undervolt I get the exact same performance, I've ran the CPU at 3.0ghz at 0.750v and still the same crumby FPS numbers. Hence the confusion.
 
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ezskills

ezskills

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My brother use to get bad performance with his Fx 8350 on the ASUS M5A78L-M/USB3 AM3+ motherboard which is a 760g chip set and he only change his motherboard to a Asus Sabertooth 990fx R 2.0 and all is well with his performance and the 760G is a very low end chip set that can't handle the fx cpu on stock.
 
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BroDubun

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Ok, thanks so much. I shall buy a new motherboard as soon as possible.
 
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BroDubun

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True, but I'm super broke right now hence why I'm sticking with fx until I can upgrade.
 
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mjslakeridge

mjslakeridge

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Run the Passmark Performance test on your current setup. With that Motherboard, my guess is you will not come close to the average reported by other users (as I said above, I didn't come close). Here is the result for your CPU:

http://www.cpubenchmark.net/cpu.php?cpu=AMD+FX-8320E+Eight-Core&id=2374

Edit: Here is an example of a 990 chipset motherboard you could use. You can use the filters on the left hand column to see all of the AM3+ motherboards and 990 chipsets available:

https://pcpartpicker.com/list/jhNBxY
 
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bigpinkdragon286

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The numbers presented in the very first post don't pass the "smell" test.

That much voltage, going through so many inefficient cores, with so high an overclock, will not run at 40ºC under load.

Even non-overclocked FX CPUs run hotter than that (I own several,) not to mention the OP says he's using the quiet fan profile for the cooler.

I'm not accusing anybody of lying, but I do suspect there is incorrect information here. If the motherboard were to throttle the chip, how would it present itself, if at all? If the temperature is to be believed, I highly suspect the CPU is never properly spooling up all of it's cores.
 
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mjslakeridge

mjslakeridge

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Agreed, something is fishy with the temps. I get bad temp readings with my FX 6300 whether using AMD Overdrive or HW Monitor. Sometimes my idle temp will show 15C when my ambient is 25C or so. I attribute that to the crappy motherboard.

 
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bigpinkdragon286

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There's more to a motherboard than the chipset, however in this case, the 7xx series chipsets were not designed with FX CPUs in mind, and as such, you should not expect a board based on an older chipset to fully implement some of the newer features such as the socket being able to deliver the increased current capacity, LLC changes, higher frequency VID line, and new (at the point it was introduced) power gating of the FX CPUs, even if the BIOS is updated to allow the CPU to function in the board.

A base level 9xx series chipset such as the 970 should be more than sufficient to get full utility from any FX CPU, provided the board supports all of the appropriate features of the CPU. The chipset is mostly irrelevant, as it is only providing features that don't really need integration in the CPU or that haven't been moved to the CPU at that point.

When your brother upgraded motherboards, a lot of variables changed, not just the chipset. He went from a 4+1 VRM configuration to an 8+2 VRM configuration, and it's also very likely the features I mentioned above were not available on the older board as well, which could have caused his FX CPU to be current limited.
 
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