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OC'ed 5850 & OC'ed 5870

Last response: in Graphics & Displays
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July 2, 2010 4:18:52 PM

So what is the maximum OC of both cards? The usual max. OC people achieve?
I can't find a review wherein both cards in max. OC are being tested face to face..
Also, what could be the temperature by that OC range?

I'm opt to buy the MSI 5850 Twin Frozr II.. but I'm open if someone can convince
me to get the 5870 (reference).. They said that 5870 is still higher due to the shader?
and the other spec. I can't remember :pt1cable: 
Also, I read a review wherein 5870 really shines in eyefinity setup (yes, I'll do eyefinity
after a couple of months or so)

Here's the review:

By the way, I currently have 23" Samsung 2333HD HDTV as my monitor..
Will by a couple more 23" with a thinner border if I got the budget for it..

More about : 5850 5870

July 2, 2010 4:21:58 PM

hmm I think I'll just post this in the Overclock section :x
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July 3, 2010 12:25:13 AM

nvidia's card is burning hot :x and the cards I stated above are more stable I believe
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July 6, 2010 10:22:33 AM

Any inputs regarding HIS 5870? especially warranty? ^^
or should I just choose between Sapphire and PowerColor?
Asus is too pricey
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a c 376 U Graphics card
July 6, 2010 10:37:53 AM

They are basically the same GPU but the HD5850 has 10% of the shaders disabled. When overclocking as they are the same processor they tend to max out at around the same speed, usually slightly over 1ghz. Keep in mind that to achieve the best overclock you want a card that allows for voltage modification of the core. All of the reference cards of both allow such but most cards sold at this point are on a custom PCB that wont allow you to up the voltage. One exception to that is the ASUS DirectCU version of the HD5850 which is what I would recommend. Failing that look for the reference design of whichever you buy.
As for their performance when they are OCed I saw a thread about exactly that a while back on overclock.net. I just looked and I can't seem to find it now but I remember that when OCed to the same speed(I think it was 1015mhz) the HD5870 only tends to be about 6-8% faster. That isn't worth the extra $100 IMO.
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Anonymous
July 6, 2010 2:07:51 PM

Well 5850 will OC to 850/1175 on most cards on standard voltage, some cards allow voltage mod and can go as far as 975+mhz. (mine maxes out at 875mhz standard voltage)

But remember, the 5870 can OC as well, probably the same clock speeds as 5850 but it has the extra shaders so will always be faster clock for clock, here in UK price difference is £100,

so I have 5870 stock performance from OC card costing £100 less, thats the reason for OC in my books!

Personally, for FPS, 470 is too expensive compared to 5870! but GTX480 takes the cake with performance and price and heat and power, its a green firebreathing monster for sure....what a card!!!
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a b U Graphics card
July 6, 2010 3:19:09 PM

Stay away from the 5850 Twin Frozr, if you want the best bang for buck 5850 get the DirectCU, if not get decent 5870 that has voltage control (most 5870 non-reference cards do not have voltage control unless altered).

Here is an example of what the DirectCU is capable of :

900/1150 1.21v (v-sync disabled)



1025/1250 1.24v (v-sync disabled)



Stock clocks are 725/1000 @ 1.18v (anything over 1025/1275 results in decrease of the cards performance)

Temps are even lower when v-sync is enabled :



On the other hand if you have good airflow and low ambient temps the 470 @ 299.99$ is the best option..
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a c 376 U Graphics card
July 6, 2010 6:10:28 PM

OvrClkr said:
(anything over 1025/1275 results in decrease of the cards performance)

This is due to the error correcting memory on the HD5850. When you push the ram too far it wont become unstable but rather it will become slower instead as it is spending more time fixing errors than the added speed makes up for.
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