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The RX 6000 series Owners' Club

Joined
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Video Card(s) AMD 6900XTXH ASRock OC Formula & Phanteks T30x3 | AMD 5700XT Sapphire Nitro+ & Arctic P12x2
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After a bit of testing, now that I have the cooling headroom for an OC, I may say my card is stable at 2860MHz core and at 2180MHz VRAM Adrenaline settings.
Note that I don't want to push my luck with VRAM, so I returned it to default, and plan to keep it that way. This was a mining card, VRAM is stressed enough already. The performance uplifts of VRAM OC are negligible anyway, and are often cause for all sorts of weird instability issues.

dssdsd.PNG

That was captured on a second display while the RDR2 occupied the main one.

All in all, considering nothing was configured outside the Adrenaline, no MPT, stock heatsink and an air cooling at around 25C ambient, I'm happy as a puppy. :)
 
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Nice, I have a reference card, so my options do not go near that high. So I tuned for performance and temps. Not that your temps are bad, no where near that. Runs cooler than mine.

I would still oc your memory, just don't push it high. I can slide the bar fully to the right, and it seems stable, have not had a crashing issue, but I just set it to 2112, so it runs at an even 2100.
 
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Nice, I have a reference card, so my options do not go near that high. So I tuned for performance and temps. Not that your temps are bad, no where near that. Runs cooler than mine.

I would still oc your memory, just don't push it high. I can slide the bar fully to the right, and it seems stable, have not had a crashing issue, but I just set it to 2112, so it runs at an even 2100.

I do the same on my 6800 XT. I haven't gotten it to crash at 2132 (2120 real MHz) but I clock it down a bit to 2112 just to ensure stability. However I understand Veseleil's concern for his VRAM with an ex-mining card as I have a used 5600 XT which was likely a mining card as well. It works great and it's rarely hitting 100% GPU usage so keeping it at stock VRAM speed will stress the already well-used VRAM a bit less.
 
Joined
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Messages
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Tel Fyr
System Name Purple Haze | Vacuum Box
Processor AMD Ryzen 7 5800X3D (-30 CO) | Intel® Xeon® E3-1241 v3
Motherboard MSI B450 Tomahawk Max | Gigabyte GA-Z87X-UD5H
Cooling Dark Rock 4 Pro, Arctic P14 & P12 case fans | 212 Evo & P12 PWM PST x2, Arctic P14 & P12 case fans
Memory 32GB Ballistix (Micron E 19nm) CL16 @3733MHz | 32GB HyperX Beast 2400MHz (XMP)
Video Card(s) AMD 6900XTXH ASRock OC Formula & Phanteks T30x3 | AMD 5700XT Sapphire Nitro+ & Arctic P12x2
Storage ADATA SX8200 Pro 1TB, Toshiba P300 3TB x2 | Kingston A400 120GB, Fanxiang S500 Pro 256GB
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Mouse Logitech G305, Bloody A91, Amazon basics, Logitech M187
Keyboard Redragon K530, Bloody B930, Epomaker TH80 SE, BTC 9110
Software W10 LTSC 21H2
I understand Veseleil's concern for his VRAM with an ex-mining card as I have a used 5600 XT which was likely a mining card as well. It works great and it's rarely hitting 100% GPU usage so keeping it at stock VRAM speed will stress the already well-used VRAM a bit less.
Couldn't say it better myself.

Nice, I have a reference card, so my options do not go near that high.
OC Formula is an XTXH chip, which in the reference model 6900XT LC is combined with a 18Gbps memory (2250MHz). The AIB 6900XTXH models have a 16Gbps memory (2000MHz) instead, just as any other AIB 6900XT or 6900XTX model. Yes, there are 3 variants. The reference 6900XTX model (never released) is the XTXH with a 18Gbps memory, just like the reference LC one.

Apart from a higher power limit than the non-XTXH (330W vs. 300W), the VRAM slider is also unlocked to 2624MHz. My card is unstable at 2250MHz, but it can run over 2200MHz. Not really stress tested, since I don't want to push my luck, as stated earlier.

The difference between regular (non-binned) 6900XT and 6950XT models are simple: 16Gbps vs. 18Gbps memory, and 300W vs. 335W power limit. Also a bit higher declared boost clocks (base, game, boost).
If you're interested, for starters you can read more about it here.
 
Last edited:
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Didnt know all that. The only reason I have this 6900 is MicroCenter had an openbox (had no box, only came in a static bag) that they would give me a full warrantee on and priced it $35 cheaper than the 6800XT I was there to buy.
 
Joined
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The difference between regular (non-binned) 6900XT and 6950XT models are simple: 16Gbps vs. 18Gbps memory, and 300W vs. 335W power limit. Also a bit higher declared boost clocks (base, game, boost).
If you're interested, for starters you can read more about it here.
The difference between 6900 and 6950 is really big, you can read here
 
Joined
Nov 2, 2020
Messages
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Tel Fyr
System Name Purple Haze | Vacuum Box
Processor AMD Ryzen 7 5800X3D (-30 CO) | Intel® Xeon® E3-1241 v3
Motherboard MSI B450 Tomahawk Max | Gigabyte GA-Z87X-UD5H
Cooling Dark Rock 4 Pro, Arctic P14 & P12 case fans | 212 Evo & P12 PWM PST x2, Arctic P14 & P12 case fans
Memory 32GB Ballistix (Micron E 19nm) CL16 @3733MHz | 32GB HyperX Beast 2400MHz (XMP)
Video Card(s) AMD 6900XTXH ASRock OC Formula & Phanteks T30x3 | AMD 5700XT Sapphire Nitro+ & Arctic P12x2
Storage ADATA SX8200 Pro 1TB, Toshiba P300 3TB x2 | Kingston A400 120GB, Fanxiang S500 Pro 256GB
Display(s) Mi 2K Gaming Monitor 27", AOC 24G2U
Case Modded MS Industrial Titan II Pro RGB | Heavily Modded Cooler Master Q500L
Audio Device(s) Audient iD14 MKII, Adam Audio T8Vs, Bloody M550, HiFiMan HE400se, Tascam TM-80
Power Supply Rosewill Capstone 1000M | Enermax Revolution X't 730W (both with P14 fans)
Mouse Logitech G305, Bloody A91, Amazon basics, Logitech M187
Keyboard Redragon K530, Bloody B930, Epomaker TH80 SE, BTC 9110
Software W10 LTSC 21H2
Joined
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Oh, yeah I mistake the links :D
 
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A few weeks ago I re-pasted my 6750xt from stock to MX-4 and saw a mild reduction in temperature. I have some PTM7950 coming. Every review I have read says it performs better than the kryosheet, is not conductive, and never pumps out. I will definitely post results when I have it installed.
It took a lot longer than expected for the PTM7950 to arrive. I purchased from ModDIY.
After I installed PTM7950 I was getting worse significantly worse hotspot temps than MX-4.
I disassembled and saw that 1/4 of the die was not making contact. I assumed user error. I must have done something wrong.
I reapplied, this time trying to take extra efforts to make perfect contact. I could visibly see space between the die and the heatsink.
I removed all the PTM7950 and reapplied MX-4. I had to apply a lot of MX-4 to ensure contact was made.
I tested with OCCT to let it increase GPU load in increments of 5% starting from 10%. At 55% it would overheat and shut down the PC.
I disassembled once again and checked that contact was being made.

It is as if something has physically changed somewhere and there is now more space between the GPU die and heatsink. I removed all the thermal pads to see if they might be causing it somehow. I made sure the raised screw holes in the heatsink were aligned and going through the holes in the GPU PCB.

I can't figure out what changed if anything.
 
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It took a lot longer than expected for the PTM7950 to arrive. I purchased from ModDIY.
After I installed PTM7950 I was getting worse significantly worse hotspot temps than MX-4.
I disassembled and saw that 1/4 of the die was not making contact. I assumed user error. I must have done something wrong.
I reapplied, this time trying to take extra efforts to make perfect contact. I could visibly see space between the die and the heatsink.
I removed all the PTM7950 and reapplied MX-4. I had to apply a lot of MX-4 to ensure contact was made.
I tested with OCCT to let it increase GPU load in increments of 5% starting from 10%. At 55% it would overheat and shut down the PC.
I disassembled once again and checked that contact was being made.

It is as if something has physically changed somewhere and there is now more space between the GPU die and heatsink. I removed all the thermal pads to see if they might be causing it somehow. I made sure the raised screw holes in the heatsink were aligned and going through the holes in the GPU PCB.

I can't figure out what changed if anything.
The height of the pad may be compromising the heat pads on the Memory or VRM. They may be too shallow to make contact with the heatsink.
 
Joined
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The height of the pad may be compromising the heat pads on the Memory or VRM. They may be too shallow to make contact with the heatsink.
With MX-4 paste on the die and no pads on the VRM or memory, there is approximately a full mm of space or more between the GPU die and heatsink.
 
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The performance uplifts of VRAM OC are negligible anyway, and are often cause for all sorts of weird instability issues.
Yeah, that's true with Radeon. Signs of VRAM instability: Jerkiness, can look like packet loss and possibly WHEA for "Cache Hierarchy Error" as reason.
 
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