Learning Memory Overclocking - Current Status: 3600mhz, 1800FCLK, 14-13-13-28

[Guest]

14 hours ago, freeagent said:

Yeah not heck of a lot of difference. Maybe its the newer bios? I didn't have any problems with the one it shipped with.. But I also don't recall getting under 62ns with that one either.

 

Ahh well, its not a deal breaker, I was just hoping I would be able to get a little closer to my 3770K in Aida for latency. Its pretty snappy as is already no complaints.. they are just numbers

 

 

Looks good. 

 

If I have time, I'll try to get you an example screen shot showing exactly what I mean about getting the memory to be efficient vs pounding the round to the ground to achieve arbitrary latency numbers.

 

[Guest]

14 hours ago, freeagent said:

Yeah not heck of a lot of difference. Maybe its the newer bios? I didn't have any problems with the one it shipped with.. But I also don't recall getting under 62ns with that one either.

 

Ahh well, its not a deal breaker, I was just hoping I would be able to get a little closer to my 3770K in Aida for latency. Its pretty snappy as is already no complaints.. they are just numbers

 

Right, always trying to tweak those numbers.

 

In this crude example, I present 16-16-16-36 cycle time 366 for both runs the rest on auto 

vs a few minor tweaks you guys probably play with no doubt. 

 

Looking for efficiency I only changed what you see in the bios screen shot.

DRAM Refresh Interval stock was 8316 on auto

FOUR ACT WIN time was 38 stock

Write recovery time, 20 seems good here.

 

Memory frequency tested at 3600mhz 16-16-16-36.

CPU 8700K 4.7ghz stock - Memory only tweaking. No other changes. HT disabled for single core performance.

 

Let's see how the efficiency curved changed slightly.

 

 

210128194526.BMP

[hihihi8]

well i figured out the random black screens, turns out it's a new DOA AX1500i. What are the chances. Can't RMA it either since I bought it off someone else. rip.

 

Luckily, I have an HX850i lying around which I hot-swapped in. fingers-crossed that fixed things. The HX850i was bought through official reseller so I do have a warranty there at least.

 

I bought both the HX850i and the AX1500i because the cables are compatible with my existing RM1000 sleeved cables. Shoulda gone for EVGA instead, sighs.

[freeagent]

8 hours ago, ShrimpBrime said:

Right, always trying to tweak those numbers.

 

In this crude example, I present 16-16-16-36 cycle time 366 for both runs the rest on auto 

vs a few minor tweaks you guys probably play with no doubt. 

 

Looking for efficiency I only changed what you see in the bios screen shot.

DRAM Refresh Interval stock was 8316 on auto

FOUR ACT WIN time was 38 stock

Write recovery time, 20 seems good here.

 

Memory frequency tested at 3600mhz 16-16-16-36.

CPU 8700K 4.7ghz stock - Memory only tweaking. No other changes. HT disabled for single core performance.

 

Let's see how the efficiency curved changed slightly.

 

 

210128194526.BMP 3 MB · 0 downloads

Thank you for taking the time to make this post, you are awesome! It looks pretty efficient.. I see what you are saying. When I get back from taking the boys to school I will play with subtimings some more and see if I can get her a little more efficient. It should be possible..

[Guest]

33 minutes ago, freeagent said:

Thank you for taking the time to make this post, you are awesome! It looks pretty efficient.. I see what you are saying. When I get back from taking the boys to school I will play with subtimings some more and see if I can get her a little more efficient. It should be possible..

Super PiMod 32m is a great way to measure.

 

I mean shaving off an entire minute is pretty big. 

 

Did that, no tricks, full OS. A pretty light OS, because it's a young install around 30 days old if that. So I might have an advantage a touch there.

[freeagent]

I just installed windows a couple of days ago so its pretty fresh, it took a beating from clocking my memory. And a minute is huge man! I was going to start a few minutes ago, but I gotta get the boys up in 4 minutes and get them ready for their day. So after that, at around 9 I will be able to play some more.

[Guest]

2 hours ago, freeagent said:

I just installed windows a couple of days ago so its pretty fresh, it took a beating from clocking my memory. And a minute is huge man! I was going to start a few minutes ago, but I gotta get the boys up in 4 minutes and get them ready for their day. So after that, at around 9 I will be able to play some more.

I'm at work, take your time.

[freeagent]

1 minute ago, ShrimpBrime said:

I'm at work, take your time.

I remember those days 

[hihihi8]

Ok so the memory OC wasnt the culprit of my instability after all. It was a bad beta BIOS. latest BIOS has been solid so far, will put the OC back in soon.

[hihihi8]

Report 7:

 

I've got it pretty satisfactory and stable at the following:

 

Global C-states disabled (or else this system crashes randomly and frequently when idling – prolly faulty CPU but whatever)

Dram Voltage: 1.485v

CPU_SOC: 1.15v

Dram Freq: 3600

FCLK: 1800

tCL: 14

tRCDRD: 13

tRCDWR: 13

tRP: 13

tRAS: 28

tRC: 42

tRRDs: 4

tRRDl: 6

tFAW: 16

tWTRs: 4

tWTRl: 10

tWR: 12

tRDRDsCL: 3

tWRWRsCL: 3

tRFC: 288

tCWL: 14

tRTP: 8

tRDWR: 8

tWRRD: 4

tWRWRsc: 1

tWRWRsd: 7

tWRWRdd: 7

tRDRDsc: 1

tRDRDsd: 5

tRDRDdd: 5

tcke: 1

Command Rate: 1T

GDM: Enabled

Power Down: Disabled

procODT: Auto

 

DRAM Current: 130%

DRAM Power Phase: Extreme

DRAM Power Phase Switching Freq: 400kHz

 

I can go down to 13-13-13-28-288 if i set command rate to 2T, but i dont think it actually yields a positive change.

[hihihi8]

According to some feedback i've received, seems like this setup is pretty rough on the IMC – quad stick, quad rank b-die, tight timings

[Guest]

15 hours ago, hihihi8 said:

Report 7:

 

I've got it pretty satisfactory and stable at the following:

 

I can go down to 13-13-13-28-288 if i set command rate to 2T, but i dont think it actually yields a positive change.

Looks good. The Memory voltage could go higher if it's a wee bit unstable. 1.50v is fine. 

 

Generally when I OC for numbers, not necessarily long term stability, I start around 1.6 Vdimm. Wouldn't be afraid of 1.55v daily though. Plenty of high speed kits starting at 1.5v easily take on another .30v. But let's not get crazy for that Cas 12. That voltage, you don't want daily. 

[hihihi8]

16 hours ago, ShrimpBrime said:

Looks good. The Memory voltage could go higher if it's a wee bit unstable. 1.50v is fine. 

 

Generally when I OC for numbers, not necessarily long term stability, I start around 1.6 Vdimm. Wouldn't be afraid of 1.55v daily though. Plenty of high speed kits starting at 1.5v easily take on another .30v. But let's not get crazy for that Cas 12. That voltage, you don't want daily. 

im more concerned about the CPU's PHY degrading with those voltages since the VDDQ output buffer shares the same voltage as VDIMM and there's no way to change that.