ampere memory clock/undervolting

[Guest]

Hi, Just wondering if anyone knows how much changing the memory clock would affect the performance of a graphics card?

 

I have an MSI GeForce RTX 3070 Ventus x2 (urgh, I know!), which I had so many issues with when I bought it (didn't help that I'd also "upgraded" to 3600Mhz ram, which although passed every RAM test you could throw it it with flying colours, still caused crashes in game......which I resolved by the way....by actually ignoring all the other guides I've seen, turning OFF XMP, and NOT setting the timings manually....but JUST changing DRAM FREQUENCY in bios to 3200, leave everything else on auto.....now runs stable, my friend had the same problem with his 3200Mhz ram XMP = crash, settings timings = crash, just setting dram frequency = perfect)......

 

....anyway, where was I.....my 3070, was overheating like crazy when i got it, but I've almost completely fixed that by undervolting and custom fan curve. I'm still deciding between 1755mhz@837mV, or 1860Mhz@887mV (temps ranging from 55-62, vs 60-68).....my card would normally boost (at stock settings) to around 1860ish, sometimes reaching 1875 for a brief moment.

 

Out of curiosity though, I wanted to try the afterburner OC scanner....as it happens, it got to 99% and then said that the results were not stable :s.....but when I was watching it do it's thing, I noticed that it was reaching around 2000-2050Mhz, at about 1068mV.....but when it was doing this, the MEMORY clock speeds were being reduced from 7000 to 6800.

 

So this left me wondering, how much impact does the MEMORY CLOCK speed have on gaming performance, and could I reduce temperatured further, or perhaps push for a higher clock speed at lower voltage by reducing the memory clock by, say, 200mhz?

 

Or have I got it completely wrong, and reducing it will have no impact on the stability, in which case, why was the scanner reducing it?

 

The whole memory clock speed thing really confuses me, especially as afterburner reports it as 7000 or 7001, whereas things like 3dmark tell me that my memory clock is always 1755 :s

 

if anyone can shed any light on all this, I'd be grateful.

[Kilrah]

Depends on the actual software you're running, best to do your own tests with your intended games.

[Guest]

11 minutes ago, Kilrah said:

Depends on the actual software you're running, best to do your own tests with your intended games.

thanks for the reply. is there any kind of general rule though? not to go below a certain level....or does anyone know if it actually even makes sense, reducing mem clock to try and stabalise a higher core clock?

[Kilrah]

Usually there's more to gain from a memory OC than from a core OC.

Core OC on Ampere is almost useless since the main limit is power. You can increase your clock but it'll only be effective at light loads, on heavy loads it's going to be nulled by the power limit.

[Guest]

2 minutes ago, Kilrah said:

Usually there's more to gain from a memory OC than from a core OC.

Core OC on Ampere is almost useless since the main limit is power. You can increase your clock but it'll only be effective at light loads, on heavy loads it's going to be nulled by the power limit.

intersting. thanks for that. So, in theory, if anything, I'd be better off sticking with my undervolts @ 1755 or 1860Mhz, and just trying to boost the mem clock by a couple hundred Mhz.....rather than reducing mem and trying to boost clock further.

 

with regard to the power limit, it can't be breeched on the ventus x2 (at least without flashing an alternat vbios, and it already runs hot, so "unlocking" it is probably a terrible idea). so it's limited to 100% anyways.

 

I'll give this a try after work later.

[xg32]

with the numbers you've given us i'd recommend sticking with 1755@837mv core, as for the memory, there isn't much to be gained from underclocking unless you have a sensor reading that indicates a hotspot overheating, as for minimum memory clock, i wouldn't go under 1750 or 7000 depending on what software ur using.

[Guest]

19 minutes ago, xg32 said:

with the numbers you've given us i'd recommend sticking with 1755@837mv core, as for the memory, there isn't much to be gained from underclocking unless you have a sensor reading that indicates a hotspot overheating, as for minimum memory clock, i wouldn't go under 1750 or 7000 depending on what software ur using.

thank you. maybe i'll stick with what i have then. 1755 and 7000 for mem.