Adding an AM leads to 100% terrain cores and blurries ...

Yes that's odd behaviour.

You're not going to be far off what's achievable so leave as-is and maybe a driver or something along the way in time will alter that behaviour. It's a very new system.

It is running very nicely now ..

Should be a no brainer for that beast.

There's a maximum capability of CPU configuration to provide the GPU with data in a timely manner. Opening one tap wider cannot improve on that but in certain systems it will be closing others in a counter productive way. What are we talking 5%? Maybe less, maybe more, will be some. In perspective with a lock fps of 25 dropping to 24 saves around 4%.

Problems of performance in fps are not due to AMs and HT these configurations only serve to confuse the system. More problems of fps are due to incorrect setup of the display as demonstrated elsewhere on the site where one user has an 88% increase in fps on a similar system due to a vsync error.

HT and AM are least understood and hence become suspected of being the perpetrator of problems.

They are actually telling us something is wrong if they behave incorrectly - they are a go/no-go gauge. 

Another problem cropped up for a friend the other day, the Windows Defender process was running amok. Make sure to get the latest updates there's been a few issues with some recent updates.

What else can I say if we want the low-down on this, simple logic prevails: Systems should perform the same HT On or Off, AMs don't make big changes to the fps per-se; poor CPU configuration will affect the GPU and that in turn affects the fps. Any major differences show a problem in the configuration of that system - be it finger trouble or software issues. 

I think an SQL server was mentioned exhibiting a problem with HT enabled at some stage in the past.

This happens even now.

The problem was no AM.

A process making big demands on one sister LP meant that the other sister LP with a brother process of the app is unable to keep up. It still worked but showed a lack of throughput and excess heat.

Same goes for many apps now. Sorry to bring the bad news about HT.

Edited April 16, 20188 yr by SteveW

...P3D avoids that situation to a certain extent but on some systems it can be quite a factor. When assessing the CPU often the system is limited in another way and the CPU doesn't show an expected change in performance characteristics.

both my 7920X and 7980XE works best with HT off, similar behavor as Gerards 7940x

2 minutes ago, westman said:

both my 7920X and 7980XE works best with HT off, similar behavor as Gerards 7940x

Exactly. As Gerard will tell you, I recommended he start with HT off and no AM, that's a certainty to work. if you can't tune it beyond that don't blame HT and AM

3 minutes ago, SteveW said:

Exactly. As Gerard will tell you, I recommended he start with HT off and no AM, that's a certainty to work. if you can't tune it beyond that don't blame HT and AM

 I dont, the 8700K works slightly better with HT on 

1 minute ago, westman said:

 I dont, the 8700K works slightly better with HT on 

Don't start with HT off before moving on? How would that have helped Gerard?

 

The first LP of the sim and the GPU, in a simplified way are responsible for the fps. The rest of the cores just serve to intervene with various amounts of data.

Put simply:

In Gerard's system a 14 core CPU, no HT No AM = AM=16383

In a 6 core system, no HT, no AM = AM=63

In fact no such thing as no AM.

So you have to ask yourself why they both work, and why yours and Gerard's do not work on six cores.