TechSpot: AMD Radeon HD 7770 & 7750 Review

Having covered the $549 and $449 territories in January with the Tahiti-based Radeon HD 7970 and HD 7950, AMD is bringing its latest generation GPU to mainstream brackets today. The new Radeon HD 7770 and 7750 use the same 28nm design process and Graphics Core Next (GCN) architecture as the 7000 series flagship, albeit in more affordable configurations.

The move to 28nm lets AMD squeeze 1500 million transistors into a 123mm2 die. In addition, the HD 7700 series die is 26% smaller than the HD 6770, while containing 44% more transistors. As impressive as those figures are, gamers will be more excited to see AMD's prices: the HD 7770 is $159 -- in line with the GeForce GTX 560 -- and the HD 7750 is even cheaper at $109, combating the GTX 550 Ti.

As discussed in the preliminary Radeon HD 7000 review, the new series represents AMD's most significant graphics architecture overhaul in the last decade. It was back then that AMD adopted the Graphics Parallel Core architecture, employing groups of scalar processors that work out very long instruction words, commonly abbreviated as VLIW. Radeon HD 5000 cards used VLIW5 and last year's HD 6000 series transitioned to a more sophisticated VLIW4 architecture. However, the HD 7970 and other cards based on the Tahiti core replace VLIW stream processor clusters with Graphics Core Next compute units.

Read: AMD Radeon HD 7770 & Radeon HD 7750 Review

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Its weaker than the 5770 in theory, just the drivers/raised clocks and little better architecture make it slightly better than the few-year-old brother. Its price is a joke compare to the weak performance, shame on you amd...

Still on the 5870v2 (ASUS) Hasn't let me down yet Glad I got my money's worth. It OCs like a charm too, and I feet it extra power with the molex slot built onto the mobo. I'm living a dream here folks, someone pinch me!!!

Don't forget that the cards are just the rebranded 6000s and even 5000s.
The only "real" 7000 cards are 7950, 7970 and 7990.

"last year's HD 6000 series transitioned to a more sophisticated VLIW4 architecture. However, the HD 7970 and other cards based on the Tahiti core replace VLIW stream processor clusters with Graphics Core Next compute units."
Why so vague? Why cover up the rebranding?

Edited by RealFduch, Feb 15 2012, 12:21pm :

RealFduch said,
Don't forget that the cards are just the rebranded 6000s and even 5000s.
The only "real" 7000 cards are 7950, 7970 and 7990.

Ermmm what? the 7700 are "real" 7000 cards to ya know?

Looking at the overall picture, the 7000 series looks to be another stop gap measure again like the 6000 was, but this is down to AMD's roadmap then anything else.

Everything 7600 and below is a rebadge of 6600 and below, and that's down to the fact that the new A series chips GPU this year are going to be funily enough based on the 6600. So they need to be the same so they can be crossfired together.

The 7700 really are an odd ball though, 7750 is at the right price its the 7770 thats thrown everyone for a loop. Yes it can on the odd game here and there it beats a 6850, but most of the time its trailing slightly or majorly behind it.

No doubt they'll release a 7790 based on a cut down 7800 some time after the 7800 launch to fill the hole.

And we have yet to see what Nvidia launch with, god knows how thats gonna affect the mix

Silver47 said,
Looking at the overall picture, the 7000 series looks to be another stop gap measure again like the 6000 was, but this is down to AMD's roadmap then anything else.

Everything 7600 and below is a rebadge of 6600 and below, and that's down to the fact that the new A series chips GPU this year are going to be funily enough based on the 6600. So they need to be the same so they can be crossfired together.

The 7700 really are an odd ball though, 7750 is at the right price its the 7770 thats thrown everyone for a loop. Yes it can on the odd game here and there it beats a 6850, but most of the time its trailing slightly or majorly behind it.

No doubt they'll release a 7790 based on a cut down 7800 some time after the 7800 launch to fill the hole.

And we have yet to see what Nvidia launch with, god knows how thats gonna affect the mix


Remember what happened when 5000 series came out. nVidia showed fake prototypes, then after more than half a year they released the extremely hot and expensive GTX ovens that had the same performance that AMD had half a year before. I fell this will happen again.

Edited by RealFduch, Feb 15 2012, 9:20pm :

RealFduch said,

Remember what happened when 5000 series came out. nVidia showed fake prototypes, then after more than half a year they released the extremely hot and expensive GTX ovens that had the same performance that AMD had half a year before. I fell this will happen again.

God I hope not. Anyone remember when it was the other way round with the 8000 and HD2000 *shudders* I was hoping to see a price drop on those 8800 GTS 640's.....

Shame, I was going to buy the 7770, but not after this and other reviews I've seen today. Will either get a 6870 or an Nvidia 560 . I really wanted to stick with AMD again, but the way their going, there gunna have no customers soon!

The pricier Radeon HD 7770 delivered 26% more speed than the HD 6770, but that's a bit misleading as the HD 6770 is a shameless rebranding of 2009's HD 5770. Because the GTX 560 smokes the HD 6770, we were hoping the HD 7770 would be at least 50% faster than its predecessor. That isn't the case unfortunately and, in fact, the new arrival couldn't tackle the GTX 560 either, averaging 18% slower frame rates.

I was hoping that too. I'm definitely not upgrading from my 5770 to a 7770 then with a paltry gain like that. Looks like NVIDIA will probably pull an ace out of their sleeve now, and I'll end up going back to them.

MightyJordan said,

I was hoping that too. I'm definitely not upgrading from my 5770 to a 7770 then with a paltry gain like that. Looks like NVIDIA will probably pull an ace out of their sleeve now, and I'll end up going back to them.


Why not go 7950/7970? They are the real cards.

RealFduch said,

Why not go 7950/7970? They are the real cards.

Seriously, are you happy/satisfied with 7950/70 cards? The only thing I like a lot is the much lower power consumption. But that's because of the new architecture, which means Nvidia will benefit likewise.

Honestly, for first time in my PC-Gaming life I could go with AMD and the 7950, but if the cost was 80-100€ less... I could give 310-330Max, not 410€ for the reference design... The performance increase ain't what I was expecting, and thus, I'll wait for Kepler.

Edited by PC EliTiST, Feb 15 2012, 3:08pm :

PC EliTiST said,

Seriously, are you happy/satisfied with 7950/70 cards? The only thing I like a lot is the much lower power consumption. But that's because of the new architecture, which means Nvidia will benefit likewise.

Honestly, for first time in my PC-Gaming life I could go with AMD and the 7950, but if the cost was 80-100€ less... I could give 310-330Max, not 410€ for the reference design... The performance increase ain't what I was expecting, and thus, I'll wait for Kepler.


I really dig the new architecture (but do not care about the manufacturing process).
I like 3Gb of VRAM which can be swapped to ARM. It looks like GPGPU heaven.
I'd wait for nVidia's cards for the Radeon prices to drop, but they are so far behind... I cannot wait much longer.

RealFduch said,
Why not go 7950/7970? They are the real cards.

A 7950 would be a bit of a tight squeeze in my case (there probably would be less than inch of space between the end of the card, and the start of the HDD enclosures), plus it's far too expensive at £350. I spent £120 on my 5770 when it came out, so I don't really wanna spend more than £150 (although it could end up rising to £200) on my next card.

I'll just keep waiting for NVIDIA to roll out their Kepler cards; by then, I'll know which ones are better, and it'll be the start of the competitive prices.