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Radeon 6670 vs 6750 vs 6670

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December 24, 2011 12:52:07 PM

i have a core i5-750 wth 4gb ram and want to upgrade my gpu for around 120$. i am looking at radeon 6670,6750,6670
which one will give best peformance with games like battlefield 3 and nfs run?? or if you kno any better ones?...i am looking for an amd card as my motherboard supports crossfire x but not sli.

More about : radeon 6670 6750 6670

a c 79 U Graphics card
December 24, 2011 1:10:08 PM

apurv104 said:
i have a core i5-750 wth 4gb ram and want to upgrade my gpu for around 120$. i am looking at radeon 6670,6750,6670
which one will give best peformance with games like battlefield 3 and nfs run?? or if you kno any better ones?...i am looking for an amd card as my motherboard supports crossfire x but not sli.

the 6750 is the most powerful among the two you listed. a 6770 is more pwoerful than the 6750.
what are your full system specs (including amperage on your psu's +12v rail)?
what display resolution do you use for games?
which mode of cfx does you motherboard support - x16+x8/x8+x8/x16+x16/x16+x4?
for bf3 (at high-ish settings) a radeon hd 6850 (usually around $140+) /6870 1 gb gddr5 ($160+) or higher - a radeon hd 6950 2 gb if possible (over your budget).

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December 24, 2011 1:17:42 PM

sorry it was a typo i meant Radeon 6770 vs 6750 vs 6670
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December 24, 2011 1:29:37 PM

de5_Roy said:
the 6750 is the most powerful among the two you listed. a 6770 is more pwoerful than the 6750.
what are your full system specs (including amperage on your psu's +12v rail)?
what display resolution do you use for games?
which mode of cfx does you motherboard support - x16+x8/x8+x8/x16+x16/x16+x4?
for bf3 (at high-ish settings) a radeon hd 6850 (usually around $140+) /6870 1 gb gddr5 ($160+) or higher - a radeon hd 6950 2 gb if possible (over your budget).


i dont kno about cfx mode but i have an asus p7p55d-e motherboard with core i5-750...a 450W psu...2x2 gb ram....as for the resoluton i currently hav a max resolution of 1368x768 with my nvidia geforce 8600 gt...but my monitor has an hdmi input and can support higher resolution

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December 24, 2011 1:32:10 PM

rolli59 said:
I am guessing that you ment to have 6770 in that line up so performance wise thay are from best down 6770>6750>6670!
If you can squeeze the wallet a little harder then HD6850 can be had for $130 after MIR http://www.newegg.com/Product/Product.aspx?Item=N82E168...

yea i meant 6770...well i live in india so the HD6850 will be around INR 10k....that is quite over budget as i am looking for something around 6-7k
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a b U Graphics card
December 24, 2011 1:39:40 PM

Get the 6770. It should be a huge upgrade over 8600gt.
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December 24, 2011 1:58:06 PM

If you are going to play at 1600 x 900 at high settings go for 6770 and anything below that the 6750 should be able to handle it well at high settings.
I am also from India... Jai Hind :) 
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a c 79 U Graphics card
December 24, 2011 2:02:37 PM

apurv104 said:
i dont kno about cfx mode but i have an asus p7p55d-e motherboard with core i5-750...a 450W psu...2x2 gb ram....as for the resoluton i currently hav a max resolution of 1368x768 with my nvidia geforce 8600 gt...but my monitor has an hdmi input and can support higher resolution

your motherboard seems to support x16+x4 cfx.
you're better off with a single card.
get the 6770. make sure you have the psu to run it.
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a c 106 U Graphics card
December 24, 2011 2:20:24 PM

The 6770 only costs a little more than the 6750 but it is more than worth it. Get the 6770. As for doing crossfire if this is your motherboard

http://www.asus.com/Motherboards/Intel_Socket_1156/P7P5...

Then don't do it. The second 4x slot is run off the south bridge which has a rather slow connection to your CPU where the PCI-E controller of your first slot is located. You would still see an increase in some games by going crossfire but it's not ideal.
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December 24, 2011 2:47:26 PM

de5_Roy said:
your motherboard seems to support x16+x4 cfx.
you're better off with a single card.
get the 6770. make sure you have the psu to run it.


i have a 450w psu and the amperage for the 12v rail is 16..the amd site says 450 or more...what else do i hav to look for in a psu??
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December 24, 2011 2:49:44 PM

thanks for the replies..i am actually going to run a single gpu but wanted to keep crossfire as option over for future..
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a c 79 U Graphics card
December 24, 2011 2:57:00 PM

apurv104 said:
i have a 450w psu and the amperage for the 12v rail is 16..the amd site says 450 or more...what else do i hav to look for in a psu??

only 16 A..... that's too low. first, upgrade your psu to a better one(before you get the gfx card), one that has around 30-40 A (continuous) on it's +12v rail. antec, seasonic, enrmax, corsair, xfx are some good brands.
apurv104 said:
thanks for the replies..i am actually going to run a single gpu but wanted to keep crossfire as option over for future..

x4 on the second slot will cost you a lot of performance. besides, 6770s in cfx tend to produce microstutter.
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a c 108 U Graphics card
December 24, 2011 3:04:57 PM

I am going to guess with it listed at 16A there must be 2 or more rails as 16A would only be 192 watts. My 300 watt power supply has more then that.

Do you have a model number for the power supply. There should be a spot that says combined 12 volt current or wattage

40 amps(Hell my I7 2600k @ 4.4 with a 5870 does not even use that much power) is overkill unless there is a plan for crossfireX in the future(if you are, at that time you will want some more power, for your resolution the 6770 will be fine on its own).

The 15 750 sips on power.

I mean my 750 takes under 40-50 watts at idle and under 140 during most games and that is with a 5770(same as a 6770 but without HDMI 1.3 if i remember right.)
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December 24, 2011 3:25:19 PM

de5_Roy said:


x4 on the second slot will cost you a lot of performance. besides, 6770s in cfx tend to produce microstutter.

i am not planning to use crossfire since i only have enough to buy one gpu so thats out of the question....
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December 24, 2011 3:28:19 PM

nukemaster said:
I am going to guess with it listed at 16A there must be 2 or more rails as 16A would only be 192 watts. My 300 watt power supply has more then that.

Do you have a model number for the power supply. There should be a spot that says combined 12 volt current or wattage

40 amps(Hell my I7 2600k @ 4.4 with a 5870 does not even use that much power) is overkill unless there is a plan for crossfireX in the future(if you are, at that time you will want some more power, for your resolution the 6770 will be fine on its own).

The 15 750 sips on power.

I mean my 750 takes under 40-50 watts at idle and under 140 during most games and that is with a 5770(same as a 6770 but without HDMI 1.3 if i remember right.)


i dont know about more than one rails since it only has one +12v written in the little matrix on its side...
its a local model so there is no use of a model number...ill check once again though...
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a c 108 U Graphics card
December 24, 2011 3:33:56 PM

Can you get me a picture?
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December 24, 2011 4:09:02 PM

nukemaster said:
Can you get me a picture?



will this do?
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a c 108 U Graphics card
December 24, 2011 4:19:22 PM

Well crap, it is not multi rail at all and by today's standards in only about a 250(if even that) watt power supply.

It is an older design with more focus on 3.3 and 5 volt power. Those rails are far less used these days. And modern power supplies deliver 80 to 90% or there total power on the form 12 volts and they can use part of that to generate there 5 and 3.3

A 6770 would be fairly close to the limit on that power supply. Too close for comfort for many users. Unless you could ensure the rest of the system was consuming as little power as possible it is hard to say it would be safe.

My i4 750 has been under volted to take even less power and runs with a 5770 on a 300 watt power supply(but it has 22 amps to work with).

My system has not personally reached the limits of even your power supply, but it is not the same as yours and i can not guarantee you will not blow that power supply up.

Here is a chart with some video cards and there power use. a 6770 and 6750 take about the same power as there 5770 5750 parts. As you can see there is a good chance of maxing out the power supply under very high usage with the 6770(5770) once you add the cpu and other components into the mix.

http://www.techpowerup.com/reviews/AMD/HD_6670/20.html
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December 24, 2011 4:24:08 PM

hey apurv, ur PSU will go around 350W or so.
So get a 6770 at most! because u dont wanna burn out ur CPU and GPU due to voltage and power fluctuation. And to be safe, consider ur requirements again, and hink about whether u can get a 6750 to be enough for u.

By the way, I am frm India 2!! Jai Hind. Over.
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December 24, 2011 4:42:19 PM

newegg.com is running a great special on a Diamond 6770. It's $109.99 with an instant $20 off with coupon code: DIA1220 then there's a $20 rebate, so $70 after rebate. That's a hard deal to beat, if your power supply is up to the task.

Bob
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December 24, 2011 4:45:59 PM

@nukemaster so it means i should take a new psu just to be safe?

@gam0reily from those charts consumption is quite similar in 6770 and 6750(5770 and 5750) so i would hav to take a new psu in any case

Jai Hind to all my indian brothers out here!
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December 24, 2011 4:53:47 PM

bfollett said:
newegg.com is running a great special on a Diamond 6770. It's $109.99 with an instant $20 off with coupon code: DIA1220 then there's a $20 rebate, so $70 after rebate. That's a hard deal to beat, if your power supply is up to the task.

Bob


i think newegg doesn't deliver to india does it??..i dont think it does :/ 
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a c 79 U Graphics card
December 24, 2011 4:59:51 PM

your psu seems quite old, reminded me of old psus for pentium 4 pcs.
anyway, you'll need a better, modern psu with enough amps on the +12v rail.
your psu has around 192 w, could be much less (due to component aging) if it is as old as i think it is. afaik the 6770 consumes around 110 w at peak (reference design). your cpu should use 95+ w at peak. it will use even more if you oc it. so if you push your cpu and gfx card, your psu will give out.
don't skimp out on psu. it is a vital component that supplies power to your whole pc.
edit: check tom's power supply section. and
http://www.tomshardware.com/forum/284314-28-power-suppl...
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December 24, 2011 5:08:07 PM

how amps should the +12v ideally have for a 6770?

EDIT: the guide says 37 recommended for 5770...so anything more than that will do?
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a c 108 U Graphics card
December 24, 2011 5:17:48 PM

apurv104 said:
@nukemaster so it means i should take a new psu just to be safe?

To be safe, yes you should.

I mean it is just TOO close even for me. People think it is crazy running the same setup on a 300 watt, but i calculated it all to fit with room to spare(even though I am told it will blow in a year. It over that age already :)  ).

Mine has 22amps so i have a bit more leeway then you do. at 16 you will be on the absolute MAX(when loaded, dile would be under 50-60 watts) and if your hard drive starts working you may push it over the edge.

Also as said, technically Capacitors do age over time, but that did not stop old stereos from running for 10-20 years back in the day. They should have selected caps of far more quality then needed.

If you do look for a PSU check the 12 volt rails since many cheap ones will use a similar setup.

I like to use the image below as a reference to a good power supply it is well labeled(lists the max since adding rails does not always work. This power supply can deliver 17 amps on either rail, but not both together. the max on rail 1 and 2 must not pass 24 amps so if 1 has 17 the other can only push 7) and as you can see dedicates almost all its power to the 12 volt rails.

You will note if ALL rails are added it is over 300 watts, this is because the 3.3 and 5 volt rails on this power supply are taken from the 12 volt rail. If you use lots of 3.3 and 5, the 12 volt rail does go down a bit(this means it will operate an older system without isses), but those rails are lightly used these days.


I hope this clears things up a bit.


EDIT---

How many amps does the card need. Going off de5_roy's 110 watt estimate the card it self @ 110 watts would be 110/12=9.1666666666667 amps

In real use the card does not get that far, but it is always good to overestimate a bit. This does not take in consideration your cpu and other parts. @ 37 amps you could be looking at a 450 to 500 watt quality power supply.

I personally think you could get by with less, but too much will not hurt anything and the power supply will run cooler as well.

With my 5770 and i5 750, i have no been able to pass 200 watts, but my parts are carefully selected to save power as well.
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December 24, 2011 7:58:07 PM

@apurv104
yup i agree with nukemaster...
Wattage does matter but its nt everythng at all when i comes to modern computing...One should consider wattage+Amperage...
Like i by my self used to have a generic psu with a dual-core system.
I didn't know much abt psu amperage and thought it was heavy(it was of 450W with 19A and yea was only single railed) enough to hold a DVD-RW Drive but the moment the drive began to spin...System Reboots..
So if a generic psu can't even push a dvd-rw drive to its limit so how can it run a High end Graphic card..? I recommend upgrading the psu before the Gpu...
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a b U Graphics card
December 24, 2011 8:27:29 PM

What resolution are you using??
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December 25, 2011 4:32:05 PM

yeah man, geta new PSU. Corsair or cooler master I think u can find in India. i would personally prefer corsair. Cooler Master is a little sub brand compared to it. Get a 500+W PSU. Atleat u'd have enough room to upgrade and also be a li'l futureproof.
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December 26, 2011 12:31:55 PM

Embra said:
What resolution are you using??

currently 1368x768 cuz thats wat my present gpu supports but would use a better one with the new one
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December 26, 2011 12:57:21 PM

thanks for the help everyone!! :D 
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December 27, 2011 11:57:14 AM

oye yaar tera monitor kitne inch ka hai??
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!