Tearing Down Intel's Video Card: DG1 Iris Xe Disassembly & Build Quality
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Date: 2021-07-10
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Comments and reviews: 10
Sam
6:53 I checked the datasheet, and they do 90A at 25C (case temp) and 57A at 100C (case temp).
Since these are not actively cooled, a better value would be the drain current at 25C (ambient) since the case is definitely above ambient. These can only do 18A in that condition (and 14A at 70C ambient, which is probably closer to what they'll see under the heatsink). That is still plenty for this application, but these mosfets were chosen for the 18A ID TA=25C and NOT for their 57A TC=100.
For power dissipation, I ran the numbers for a very accurate MOSFET loss model I built (assuming Vin=12, Vout=1.1, sw= 500 kHz, L= 47 nH and drive=5V) and for 10A out, the two QN3106 LSM we're looking at about 1.395W per each MOSFET. I was not able to get a datasheet for the QN3104, but I assume it's pretty similar but with 4 milliohms instead of 6). The HSM will dissipate 0.359W for a total power loss of 3.149W and an efficiency of 77.90% These numbers are per-phase, so this would be for a 20A total current load, or 22W at 1.1V
If we double this to 20A per phase, the numbers are: LSM: 2.13 each. HSM:0.772 total=5.032W per phase, efficiency = 80.7% if the CPU is drawing 40A=44W. Any higher and you will have to heatsink the mosfets.
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6:53 I checked the datasheet, and they do 90A at 25C (case temp) and 57A at 100C (case temp).
Since these are not actively cooled, a better value would be the drain current at 25C (ambient) since the case is definitely above ambient. These can only do 18A in that condition (and 14A at 70C ambient, which is probably closer to what they'll see under the heatsink). That is still plenty for this application, but these mosfets were chosen for the 18A ID TA=25C and NOT for their 57A TC=100.
For power dissipation, I ran the numbers for a very accurate MOSFET loss model I built (assuming Vin=12, Vout=1.1, sw= 500 kHz, L= 47 nH and drive=5V) and for 10A out, the two QN3106 LSM we're looking at about 1.395W per each MOSFET. I was not able to get a datasheet for the QN3104, but I assume it's pretty similar but with 4 milliohms instead of 6). The HSM will dissipate 0.359W for a total power loss of 3.149W and an efficiency of 77.90% These numbers are per-phase, so this would be for a 20A total current load, or 22W at 1.1V
If we double this to 20A per phase, the numbers are: LSM: 2.13 each. HSM:0.772 total=5.032W per phase, efficiency = 80.7% if the CPU is drawing 40A=44W. Any higher and you will have to heatsink the mosfets.
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Just
11:45 Now the clock wasn't stable. That's a thermal matter though, we think. From what we've looked at. Maybe strapping a fan to this, would fix that. We can play around with that. in another piece, if there's interest.
Me: YES! Absolutely! LOL Okay, so I know, it's not like you're going to get much out of this card. It's not competitive. There is probably zero point in aftermarket cooling mods. I get that. LOL Still, I AM curious what you can make this thing actually do. Even just some TIM on the mem and a fan...
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11:45 Now the clock wasn't stable. That's a thermal matter though, we think. From what we've looked at. Maybe strapping a fan to this, would fix that. We can play around with that. in another piece, if there's interest.
Me: YES! Absolutely! LOL Okay, so I know, it's not like you're going to get much out of this card. It's not competitive. There is probably zero point in aftermarket cooling mods. I get that. LOL Still, I AM curious what you can make this thing actually do. Even just some TIM on the mem and a fan...
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Blahorga
I might very well have missed this, but does anyone have any idea why Intel released the DG1 in a state where it will only work with certain motherboards? Wondering as I can't remember there ever being another graphics card that was limited like this, and I've been tinkering or working with computer tech since the very early 80's.
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I might very well have missed this, but does anyone have any idea why Intel released the DG1 in a state where it will only work with certain motherboards? Wondering as I can't remember there ever being another graphics card that was limited like this, and I've been tinkering or working with computer tech since the very early 80's.
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Sogen
That end screen made me wet...
Also I think it'd be fun to put some high end thermal paste and a fan on that thing and see how it scales with better thermals. Then, if possible, overclock it. Might offer some insight into the architecture, or a fun waste of time.
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That end screen made me wet...
Also I think it'd be fun to put some high end thermal paste and a fan on that thing and see how it scales with better thermals. Then, if possible, overclock it. Might offer some insight into the architecture, or a fun waste of time.
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bigsportsman
I would like to see a couple of things. 1) a slight OC with it (if at all possible) 2) I would like to see if the thermals get better with a higher quality termal paste. I think that would be interesting just from a curiosity standpoint.
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I would like to see a couple of things. 1) a slight OC with it (if at all possible) 2) I would like to see if the thermals get better with a higher quality termal paste. I think that would be interesting just from a curiosity standpoint.
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cmdrmonkey
Just toss it right in the trash. These cards are instant e-waste. The worst part is that space at the fabs that was wasted on this junk could have been used on real GPUs.
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Just toss it right in the trash. These cards are instant e-waste. The worst part is that space at the fabs that was wasted on this junk could have been used on real GPUs.
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123zatchbell
Can you do it more dramatic so it makes it look like it's harder bahahah i love you Steve you and the crew have this sense of humor thats not too much and it kills me
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Can you do it more dramatic so it makes it look like it's harder bahahah i love you Steve you and the crew have this sense of humor thats not too much and it kills me
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Wisq
Always like seeing a decent passively cooled card. Good for basic workstations and Plex servers and the like. Not everything needs to be top-end gaming hardware.
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Always like seeing a decent passively cooled card. Good for basic workstations and Plex servers and the like. Not everything needs to be top-end gaming hardware.
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Andreas
In addition to strapping a fan to the heat sink, repaste the GPU and add thermal pads to the memory and VRM's. Test again and see if anything improves.
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In addition to strapping a fan to the heat sink, repaste the GPU and add thermal pads to the memory and VRM's. Test again and see if anything improves.
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Dank
It's not like Intel is some smol indie company, but... it's exciting for some reason when they made this. Thanks for showing its guts in all their glory!
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It's not like Intel is some smol indie company, but... it's exciting for some reason when they made this. Thanks for showing its guts in all their glory!
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