Originally Posted by B!0HaZard
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?