Memory questions...

[SunDevil56 183]

Thinking of upgrading my memory, should I just concentrate on the memory's speed, or should I also go for the lowest latency...??

[mpw8679 428]

1 hour ago, SunDevil56 said:

Thinking of upgrading my memory, should I just concentrate on the memory's speed, or should I also go for the lowest latency...??

U definitely want to pay attention to the latency.  What speed are u looking at?

[SunDevil56 183]

27 minutes ago, mpw8679 said:

U definitely want to pay attention to the latency.  What speed are u looking at?

3466. My mobo supports up to 4000 I believe.

Edited January 20, 2019 by SunDevil56

[mpw8679 428]

1 hour ago, SunDevil56 said:

3466. My mobo supports up to 4000 I believe.

I would go no higher then a cl16.  Or look at 3200 at cl14.

[SunDevil56 183]

OK, thanks Matt...

[lownslo 592]

See Bob's post in this thread:

Greg

[SunDevil56 183]

1 hour ago, lownslo said:

See Bob's post in this thread:

 

Thanks Greg.

Yes, I have read that thread before, and Bob posted some great info there...

Using Bob's formula i've come up with a figure of 9.2ns "true latency" for the memory i've selected, (G.Skill Trident Z DDR4 3466 CAS Latency 16) and this would qualify as at, or very near, "performance level" memory by Bob's calculations....

Bob's recommendations on "true latency" for memory.....

9ns is performance-level, 10ns is average, and above 10ns is slow consumer-grade stuff.

 

Edited January 20, 2019 by SunDevil56

[lownslo 592]

Another important variable in this is your budget.

Greg

Edit: Just noticed you have a very cool co-pilot! 🥂

Edited January 20, 2019 by lownslo
The cat!

[AnkH 2,233]

11 hours ago, SunDevil56 said:

this would qualify as at, or very near, "performance level" memory by Bob's calculations....

Bob's recommendations on "true latency" for memory.....

9ns is performance-level, 10ns is average, and above 10ns is slow consumer-grade stuff.

Did you realize that Bob's recommendation are numbers that are extremely close together. I would definitively not to for those 3466MHz CL16 modules. As mentioned, 3200MHz CL14 should be the starting point with 8.75ns. Either choose those (there are a lot available to a reasonable price) or try to go lower on latency. In the end, latency is slightly more important than bandwith (simply because bandwith is already quiet high with DDR4 modules above 3000MHz), so I would in any case prefer the 3200MHz CL14 over the 3466MHz CL16 modules.

[fghdgdfdfgfgf 111]

for kicks a giggles but maybe somewhat relevant if OP decides to overclock the new sticks-

GSkill's - 3200 c14 slightly overclocked

 

...

 

[SunDevil56 183]

Hey Ken, thanks for the suggestion, but overclocking CPU's GPU's, and RAM has just never really been in my wheelhouse. As Steve put it (more or less).... Some people prefer to just slap in the best hardware they can afford, open the barn door, and let the horses run...😁

FWIW, with just a very few cfg tweaks, including an AM graciously supplied by Steve, i'm getting great overall performance, it's smooth, virtually stutter free, and very good fps, even in some of the most demanding scenery and weather environments, and I have a lot of higher end scenery and AC installed, and my P3D settings are mostly very high or above.... So I guess you could say i'm a pretty happy camper overall with the way my system and setup are working. Even so, i've learned a lot from you guys, and i'm always looking at what people are doing to improve the P3D experience...

Cheers,

Scott

[diajohn 164]

I understand and thanks for the education.  Now does it really make much of a difference when running P3D?

[SunDevil56 183]

11 minutes ago, diajohn said:

I understand and thanks for the education.  Now does it really make much of a difference when running P3D?

Not sure who this was directed at, but that's kind of a proverbial "$64,000 question" to put it mildly...

If you can be a little more specific about what it is you want to know it would be very helpful to anyone who might want to respond here...😉

[Bob Scott 7,714]

17 hours ago, AnkH said:

Did you realize that Bob's recommendation are numbers that are extremely close together.

Not sure I follow here...the difference between cutting-edge 8.25ns RAM and average 10ns RAM is 17.5%...not close together at all when related to the CPU speed.  A 5GHz CPU will tick through almost 9 additional idle clock cycles waiting for data with the average RAM vs the high-end stuff.

Does it make a difference?  It sure seems to, especially in areas of dense autogen and/or photoscenery (think ORBX SoCal).  When you see performance hits like dropping frame rate and/or stutters, yet neither the CPU nor GPU are close to maxxed out when it's happening, I believe that limited memory bandwidth is the culprit in that situation.

Regards

 

[SunDevil56 183]

7 minutes ago, w6kd said:

Not sure I follow here...the difference between cutting-edge 8.25ns RAM and average 10ns RAM is 17.5%...not close together at all when related to the CPU speed.  A 5GHz CPU will tick through almost 9 additional idle clock cycles waiting for data with the average RAM vs the high-end stuff.

Does it make a difference?  It sure seems to, especially in areas of dense autogen and/or photoscenery (think ORBX SoCal).  When you see performance hits like dropping frame rate and/or stutters, yet neither the CPU nor GPU are close to maxxed out when it's happening, I believe that limited memory bandwidth is the culprit in that situation.

Regards

 

Thanks Bob, I appreciate the clarification on this.

BTW, fellow Ham here, callsign N3TTN, 73'..😎

Edited January 22, 2019 by SunDevil56