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Is a 7950 really better? - Page 4

post #31 of 39
According to reviews it overclocks just fine, could be better of course but its fair enough tongue.gif http://www.legitreviews.com/amd-radeon-r9-270x-sapphire-toxic-r9-270x-review_125979/12

Edit: The only real downside to the 270x is its 256 bit memory bus, which still is not that bad smile.gif
Edited by jaydude - 10/26/13 at 3:59am
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post #32 of 39
Quote:

dav, i don't mean to rub it but i got my 7950 for $180 with 3 games.
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post #33 of 39
well i got the mobo,cpu,ram,psu,and cpu coler for free band new a gift from @Switchblade1969 oh and i also got a mose and mose pad and a knuker but that got moved on got a cyborg v7 for free of sufffy a teacher at school they key bord os second hand tho
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post #34 of 39
Quote:
Originally Posted by davcc22 View Post

well i got the mobo,cpu,ram,psu,and cpu coler for free band new a gift from @Switchblade1969 oh and i also got a mose and mose pad and a knuker but that got moved on got a cyborg v7 for free of sufffy a teacher at school they key bord os second hand tho

lucky bastard. just kid. crossfire the 7870. beats the 290X.
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post #35 of 39
yeah am going to one i get a job im getting a 750w HCG of him cos it did not work in his amd sig rig
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post #36 of 39
Thread Starter 
Quote:
Originally Posted by B!0HaZard View Post

Please look at the specs at the bottom of this page. The 270X is physically identical to the 7870. They have the same amount of stream processors, ROPs, memory and they're both Pitcairn GPUs. Or look here:
So what makes it faster than the 7870? The clock speeds. The core is clocked a bit higher and the memory is clocked a lot higher.
Okay, so we've established that a 270X is an overclocked 7870.

Ask yourself, was the 7870 as fast as a 7950? No, even when both were stock, the 7870 was slightly slower. So how did they react to overclocking? The 7870 starts out at a stock 1 GHz core clock speed. That doesn't leave much room for overclocking. Most 7000 series cards can be pushed to somewhere between 1100-1300 MHz on the core, memory overclocks fluctuate a LOT more but matter less than the core clock. The 270X is an overclocked 7870 so how much overclocking potential does it have? Even less than the 7870.
The 7950 OTOH has a stock core clock of 800 MHz. You wouldn't think that today as most manufacturers have increased clocks. If the review doesn't say 7950 Boost edition then that is the clock speed that review sites use for their 7950 numbers. An 800 MHz 7950. The official Boost edition has a default clock of 850 MHz and can boost to 925 MHz and most cards are clocked higher from the factory (e.g. Gigabyte clocks them at 1 GHz). All the 7950 cards regardless of stock clocks and factory clocks can be overclocked to 1100-1300 MHz as well assuming you have voltage control or a high stock voltage (e.g. Gigabyte uses 1.25 V as their default voltage (1.3 V being the max) so their voltage locked card will still overclock very well).

To sum up what we know so far:
  • The 7870 is a slower card than the 7950 when both are stock.
  • Reviewers use 800 MHz 7950's unless otherwise specified, today they are 925 MHz at stock.
  • The 270X is an overclocked 7870 which makes it as fast as a stock 7950.
  • The 7870 has about half the overclocking potential the 7950 has.
  • The 270X being an overclocked 7870 has even less overclocking potential.

The only logical conclusion is that an overclocked 7950 is a lot faster than a stock 270X and a good bit faster than an overclocked 270X since the 7950 has far more overclocking potential.

People would've ridiculed you for suggesting that the 7870 is as fast as a 7950 for $50 less so why would you suggest that the 270X, literally an overclocked 7870, is just that?

So between a 7870 or a 270 which one would you recommend? I guess another major reason why I probably would not buy 7950 is because I'm still sporting a i5-750.

Don't get me wrong you make valid points but I never would have to 7950 to begin with I merely wanted to know why they recommended over 270. and youve made it clear.

Another thing to consider is that a 270 supports a newer directx and OpenGL over a 7870.
Edited by Bryst - 10/26/13 at 4:21am
post #37 of 39
Quote:
Originally Posted by B!0HaZard View Post

Please look at the specs at the bottom of this page. The 270X is physically identical to the 7870. They have the same amount of stream processors, ROPs, memory and they're both Pitcairn GPUs. Or look here:
So what makes it faster than the 7870? The clock speeds. The core is clocked a bit higher and the memory is clocked a lot higher.
Okay, so we've established that a 270X is an overclocked 7870.

Ask yourself, was the 7870 as fast as a 7950? No, even when both were stock, the 7870 was slightly slower. So how did they react to overclocking? The 7870 starts out at a stock 1 GHz core clock speed. That doesn't leave much room for overclocking. Most 7000 series cards can be pushed to somewhere between 1100-1300 MHz on the core, memory overclocks fluctuate a LOT more but matter less than the core clock. The 270X is an overclocked 7870 so how much overclocking potential does it have? Even less than the 7870.
The 7950 OTOH has a stock core clock of 800 MHz. You wouldn't think that today as most manufacturers have increased clocks. If the review doesn't say 7950 Boost edition then that is the clock speed that review sites use for their 7950 numbers. An 800 MHz 7950. The official Boost edition has a default clock of 850 MHz and can boost to 925 MHz and most cards are clocked higher from the factory (e.g. Gigabyte clocks them at 1 GHz). All the 7950 cards regardless of stock clocks and factory clocks can be overclocked to 1100-1300 MHz as well assuming you have voltage control or a high stock voltage (e.g. Gigabyte uses 1.25 V as their default voltage (1.3 V being the max) so their voltage locked card will still overclock very well).

To sum up what we know so far:
  • The 7870 is a slower card than the 7950 when both are stock.
  • Reviewers use 800 MHz 7950's unless otherwise specified, today they are 925 MHz at stock.
  • The 270X is an overclocked 7870 which makes it as fast as a stock 7950.
  • The 7870 has about half the overclocking potential the 7950 has.
  • The 270X being an overclocked 7870 has even less overclocking potential.

The only logical conclusion is that an overclocked 7950 is a lot faster than a stock 270X and a good bit faster than an overclocked 270X since the 7950 has far more overclocking potential.

People would've ridiculed you for suggesting that the 7870 is as fast as a 7950 for $50 less so why would you suggest that the 270X, literally an overclocked 7870, is just that?

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post #38 of 39
Quote:
Originally Posted by Bryst View Post

So between a 7870 or a 270 which one would you recommend? I guess another major reason why I probably would not buy 7950 is because I'm still sporting a i5-750.

Don't get me wrong you make valid points but I never would have to 7950 to begin with I merely wanted to know why they recommended over 270. and youve made it clear.

Another thing to consider is that a 270 supports a newer directx and OpenGL over a 7870.

Some features in graphics API's require certain hardware on the cards, but since the 270X hasn't changed physically, it doesn't support anything the 7870 doesn't. Since they are physically identical, the 7870 can support the same features with a driver update. AMD has already said that the 7000 series will support DX11.2.

Between the 7870 and the 270X, I'd go with the cheapest. Both cards should overclock equally well so you can eliminate the performance difference between 7870 and 270X. Regardless of whether AMD decides to enable DirectX 11.2 or the new OpenGL features on the 7870, AMD Mantle works on both cards and will be superior to DirectX anyway which means that the 7870 and 270X will perform exactly the same and have the same features in Mantle games. Frostbite 3 for example will feature Mantle and EA said that 15+ Frostbite 3 games are in development all of which should thus feature Mantle.
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post #39 of 39
OP the first point do not see reviews which show a HD 7950 at 800 mhz. that card has been replaced more than a year back by HD 7950 boost at 925 mhz. secondly the HD 7950 boost cards clock 925 - 1000 mhz depending on vendor and model. they easily run at 1100 - 1150 mhz with a bit of voltage tweaking.

the HIS HD 7950 iceq boost is selling for USD 225 (210 after MIR). grab it when it comes back in stock. btw you need 30 cm of clearance. this is a huge card. your case seems to support cards upto 13.5 inches.

http://www.silverstonetek.com/product.php?pid=314

here is a HD 7950(1195 mhz) vs GTX 760(1254 mhz)
http://www.hardocp.com/article/2013/10/21/asus_geforce_gtx_760_directcu_ii_oc_video_card_review/9#.UmyjCVP098E

at the same clocks HD 7950 is roughly 30 - 35% faster than a R9 270X / HD 7870. its a beast of a card. thumb.gif
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