AMD 7800 / 7700 reviews

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blckgrffn

Diamond Member
May 1, 2003
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www.teamjuchems.com
What's waiting 8 months when you could have got a GPU that's 3% faster? :D
I mean, it's got the new shiny display bits and a couple years down the road if you are looking at used cards these are going to be more desirable than an older card (obviously?) but yeah... clearly engineering challenges were encountered.

It's still not as bad as say 2022 was for GPUs, but that's damning with faint praise.
 

Hans Gruber

Platinum Member
Dec 23, 2006
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The reviews are pretty bad. Basically RDNA 3 is enhanced 7nm that they call 6nm and Nvidia is running the real 5nm stuff that is enhanced that they call 4nm. The performance between the 6800xt and 7800xt is negligible at best and the power efficiency is due to RDNA 3 being on slightly more efficient 7nm silicon.

The 6800xt has been the AMD card for more than a year. It looks as if the 6800xt is still the card. That is sad, AMD lacks innovation or compelling products right now. I hate Nvidia but they are damn good at what they do.

I would think the ancient 7nm process that Zen2 and RDNA 2 are based on would be super cheap today. Why not just have another product cycle of the 6800xt for $300 and call it a day? Vram prices are in the dump and all three GPU manufacturers are pricing cards as if Vram is expensive. They should have 32GB GDDR6 cards on the market.
 
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Timorous

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Oct 27, 2008
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Both seem to OC well. 7800 can get +15% and 7700 can get + 17% from undervolt and playing with sliders.

7800 seems to be the better value. Will see how much they are in a couple of months.
 

PJVol

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May 25, 2020
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HWUB showed Powercolor and XFX cards running (probably tomb raider) and there's some weird clocks issue with the former.
Aside from that, they have 7800xt a bit faster than 6800xt, with or without RT.
Though the RT gain is too little for the amount of added compute power.
 
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gdansk

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Feb 8, 2011
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The reviews are pretty bad. Basically RDNA 3 is enhanced 7nm that they call 6nm and Nvidia is running the real 5nm stuff that is enhanced that they call 4nm. The performance between the 6800xt and 7800xt is negligible at best and the power efficiency is due to RDNA 3 being on slightly more efficient 7nm silicon.
N32 is mixed 6nm (memory controller dies) and 5nm (compute die). Nvidia doesn't call their customized 5nm "4nm" but "4N" and notably this is not TSMC's N4. In either case, no idea what you're talking about they both have the "real 5nm stuff". Basically RDNA3 is not enhanced 7nm except for N33.
 

SolidQ

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Jul 13, 2023
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TPUs samples were all mega overvolted, they were able to take a stock 1.15v ootb all the way down to 0.95v with no issues.
Very interesting, need to wait more OC tests
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F5WGmuEWYAAr5Ui
 

Timorous

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Oct 27, 2008
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Just seen some prices in the UK the 7800XT Pulse can be had for £480 which is £20 less than the cheapest 6800XT was available for.

For OCing it looks it comes down to how much you can undervolt to free up power headroom.
 

Hans Gruber

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Dec 23, 2006
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N32 is mixed 6nm (memory controller dies) and 5nm (compute die). Nvidia doesn't call their customized 5nm "4nm" but "4N" and notably this is not TSMC's N4. In either case, no idea what you're talking about they both have the "real 5nm stuff". Basically RDNA3 is not enhanced 7nm except for N33.
You are arguing semantics here. What AMD is doing with their silicon is very confusing. It should be the same silicon that AMD uses in Zen 4 but it's not. Some of their GPU's are based on N6 which is what I was referring to as 7nm silicon enhanced which some refer to as 6nm.

My point is that Nvidia is benefiting from being on the most advanced TSMC silicon short of 3nm which doesn't release until the Iphone 15 later this month or next month. Apple referred to the N4 TSMC silicon as 4nm when they released the iphone 14 last year.

Apple introduced the A16 Bionic chip with the iPhone 14 Pro and ‌iPhone 14 Pro‌ Max last year. Apple claims that it is a 4nm chip because it uses TSMC's "N4" process, but in reality it is made with an enhanced version of TSMC's 5nm N5 and N5P processes.

You can clearly see the power savings the 40 series cards have over the RDNA 3 cards. The efficiency gains from RDNA 2 6800xt to RDNA 3 7800xt are not very substantial. I could be wrong but the 7800xt and 7700xt appear to be on the N6 silicon. The 7900xtx is on the same 5nm TSMC silicon as the Zen 4 CPU's.
 

gdansk

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Feb 8, 2011
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You are arguing semantics here. What AMD is doing with their silicon is very confusing. It should be the same silicon that AMD uses in Zen 4 but it's not. Some of their GPU's are based on N6 which is what I was referring to as 7nm silicon enhanced which some refer to as 6nm.

My point is that Nvidia is benefiting from being on the most advanced TSMC silicon short of 3nm which doesn't release until the Iphone 15 later this month or next month. Apple referred to the N4 TSMC silicon as 4nm when they released the iphone 14 last year.
No, I'm not arguing semantics. N32 benefits from "being on the most advanced TSMC silicon". Unfortunately, AMD bungled it. But it's not the processes fault just their implementation.
I could be wrong but the 7800xt and 7700xt appear to be on the N6 silicon. The 7900xtx is on the same 5nm TSMC silicon as the Zen 4 CPU's.
You are wrong. N32 is following the same arrangement as N31 but with 4 MCD and a smaller GCD. But it's pushed further out of its efficiency curve because it only has 60CU.
 
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Heartbreaker

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Apr 3, 2006
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You are arguing semantics here. What AMD is doing with their silicon is very confusing. It should be the same silicon that AMD uses in Zen 4 but it's not. Some of their GPU's are based on N6 which is what I was referring to as 7nm silicon enhanced which some refer to as 6nm.

My point is that Nvidia is benefiting from being on the most advanced TSMC silicon short of 3nm which doesn't release until the Iphone 15 later this month or next month. Apple referred to the N4 TSMC silicon as 4nm when they released the iphone 14 last year.

Apple introduced the A16 Bionic chip with the iPhone 14 Pro and ‌iPhone 14 Pro‌ Max last year. Apple claims that it is a 4nm chip because it uses TSMC's "N4" process, but in reality it is made with an enhanced version of TSMC's 5nm N5 and N5P processes.

You can clearly see the power savings the 40 series cards have over the RDNA 3 cards. The efficiency gains from RDNA 2 6800xt to RDNA 3 7800xt are not very substantial. I could be wrong but the 7800xt and 7700xt appear to be on the N6 silicon. The 7900xtx is on the same 5nm TSMC silicon as the Zen 4 CPU's.

His point stands. 4N is not N4. This is just the game NVidia plays renaming practically ever process node it uses like they invented it.

The reality is, every big customer works with TSMC for months to tweak the formula for their usage, and it's only NVidia that claims that it's a different process just for them.
 

DAPUNISHER

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If I don't suffer significant damage or end up homeless due to a massive hurricane next week (at the moment the models have it pointed at my area) I will probably buy either the Steel Legend 7800XT, XFX Merc, or Red Devil. The white ASRock would look pretty sick in one of my NR200 stormtroopers.
 

beginner99

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Ok, performance lands about were expected, a bit slower than a 6800xt. power use sadly a bit high, yes better than a 6800 xt but not much for a new node.

But here they are not listed yet, so no price yet but given some mentiniing lower than US dollar pricing I'm optimistic it might actually be cheaper than I expected.
 

Heartbreaker

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Apr 3, 2006
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Ok, performance lands about were expected, a bit slower than a 6800xt. power use sadly a bit high, yes better than a 6800 xt but not much for a new node.

But here they are not listed yet, so no price yet but given some mentiniing lower than US dollar pricing I'm optimistic it might actually be cheaper than I expected.

You mean bit faster than 6800XT? Pricing in Canada looks better than 6800XT so overall it's an improvement.
 
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insertcarehere

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Jan 17, 2013
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You are wrong. N32 is following the same arrangement as N31 but with 4 MCD and a smaller GCD. But it's pushed further out of its efficiency curve because it only has 60CU.

Very far out the efficiency curve it seems:
1694018614203.png
Forget the Ada series, if a year ago anyone on this forum even dare speculate that any RDNA 3 SKU would have worse efficiency than a Nvidia Ampere SKU they would have gotten laughed at/banned, yet here we are...
 
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PJVol

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May 25, 2020
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Not quite on topic, but still, can anyone recall if the reviews from the fermi/kepler era had separate charts like "40 games in Tesselation Performance" or "Gameworks benchmarks"?

Forget the Ada series, if a year ago anyone on this forum even dare speculate that any RDNA 3 SKU would have worse efficiency than a Nvidia Ampere SKU they would have gotten laughed at/banned, yet here we are...

This possibly meant to be sarcastic, otherwise I don't see how did you come to "worse efficiency" than Ampere?
Even RDNA2 is more efficient, let alone 3
 
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TESKATLIPOKA

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May 1, 2020
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According to TPU review, It basically ties with RX 6900XT If you average Raster and RT.
relative-performance-3840-2160.png
relative-performance-rt-3840-2160.png

From the cards they tested, 7700XT OC provides 16.8-17.8% gain and 7800XT OC provides 12.3-14.9%.
I find It very interesting that actually the cut-down version is capable of >3GHz OC.
 
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