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[OFFICIAL] FX-8320/FX-8350 Vishera Owners Club - Page 316

post #3151 of 67692
Shouldn't have 8320 in that comparison either. It's known by now that the 8320's need more voltage than the 8350 for same speeds.
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post #3152 of 67692
Quote:
Originally Posted by auraofjason View Post

The GA-970A-UD3 DOES have vrm heat sinks, in fact the same exact ones as the GA-990FXA-UD3. Same exact 8+2 phases too. Oh and I put 1.5v since that's what it needs in the bios. It only needed 1.44v in windows to be 100% stable. It goes to 1.44v on load due to vdroop.
And also, after putting up my pll voltage, I only need 1.4v (probably less, have not tested) for that 4.6ghz. I'm at 4.8ghz at 1.47v in windows now.

My mistake. I looked up the GA-970A-DS3 Rev 1.1. So your board is a Rev 1.0 without LLC? It was the listing of Rev 1.1 that threw me off cheers.gif

Also, 4.6Ghz @ 1.4 is very nice.
Quote:
Originally Posted by Krusher33 View Post

Shouldn't have 8320 in that comparison either. It's known by now that the 8320's need more voltage than the 8350 for same speeds.

It's neither a comparison of Motherboard Quality, or an Overclockers capebility. The point of listing the two different CPU models on different boards with a similar overclock at nearly the same voltage was to ask the question: "Is there another factor on these chipsets that is causing the increased voltage?"

** also in the example. It's the 8320 that is using less power than the 8350
Edited by ComputerRestore - 11/13/12 at 4:02pm
post #3153 of 67692
Quote:
Originally Posted by auraofjason View Post

The GA-970A-UD3 DOES have vrm heat sinks, in fact the same exact ones as the GA-990FXA-UD3. Same exact 8+2 phases too. Oh and I put 1.5v since that's what it needs in the bios. It only needed 1.44v in windows to be 100% stable. It goes to 1.44v on load due to vdroop.
And also, after putting up my pll voltage, I only need 1.4v (probably less, have not tested) for that 4.6ghz. I'm at 4.8ghz at 1.47v in windows now.
That almost exactly what I'm finding with my non LLC board look at this :
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post #3154 of 67692
Quote:
Originally Posted by ComputerRestore View Post

My mistake. I looked up the GA-970A-DS3 Rev 1.1. So your board is a Rev 1.0 without LLC? It was the listing of Rev 1.1 that threw me off cheers.gif
It's the Rev 1.1 with LLC, but the LLC on this is stupid lol. There's only two options: Regular and Ultra.

Basically if you set 1.5v in bios you get to choose: "in loads do you want 1.4v with regular or 1.6v on extreme in windows? While idle, do you want 1.6v with regular or 1.4v with extreme?"
post #3155 of 67692


Why is my level 2 cache read so slow?
post #3156 of 67692
Quote:
Originally Posted by bmgjet View Post


Why is my level 2 cache read so slow?

That actually looks about right for how these bench l2.
post #3157 of 67692
Shouldn't it be higher than L3 though?
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post #3158 of 67692
Quote:
Originally Posted by Krusher33 View Post

Shouldn't it be higher than L3 though?
You would think, but none of my benches on any setting did any better, it only seems to outshine l3 in copy and write, read may be suffering due to module design.
post #3159 of 67692
Quote:
Originally Posted by Krusher33 View Post

Shouldn't it be higher than L3 though?

Exactly my thought,
Been trying some more settings and NB/HT overclocking brings it up slowly until 2.58nb and 3ht. Then it starts going back down.

Maybe thats one of the areas PD could do with improvement.
Having a slow L2 read must be holding a few things back.
post #3160 of 67692
Quote:
Originally Posted by bmgjet View Post

Exactly my thought,
Been trying some more settings and NB/HT overclocking brings it up slowly until 2.58nb and 3ht. Then it starts going back down.
Maybe thats one of the areas PD could do with improvement.
Having a slow L2 read must be holding a few things back.

There's definitely some sort of bottleneck with the CPUNB. My guess is that the IMC can't handle RAM speeds past the point that we're all seeing scaling in frequency. When we tighten up the timings, we're actually tightening up the IMC and the RAM. I'm thinking it's a similar situation to when a GPU is PCIe limited (like running at 1x). It doesn't matter how far you overclock the GPU, it's not going to get data fast enough so overclocking the isn't going to improve performance. There's probably some part of Piledriver that can't get data from the CPU to RAM fast enough, so overclocking the RAM doesn't increase bandwidth, since something else is holding everything back.

That's just a guess though. There definitely is a bottle neck somewhere, it's the only logical explanation for why bandwidth isn't scaling with higher frequency RAM while it scales on Intel. The fact that CPUNB overclocking doesn't help is quite worrying. The bottleneck is probably something you can't fix with more clock speed, which would explain why CPUNB and RAM frequency overclocking yields very little results after a certain threshold.

Hopefully whatever it is AMD fixes. I also think this bottleneck is very, very visible in Aida Photoworxx benchmark (but I wouldn't mind if someone else could confirm it as well. The AIDA64 page says that it is designed to test for bandwidth problems, and my 5ghz FX 8350 scores the same as FX 8150 stock.

I hope they fix it in the next iteration and that we get Steamroller in 2013 or early 2014 and PD 2.0 has some improvements here. It's definitely got to be holding Piledriver back in lots of workloads.
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