4870 + AC Accelero S1 Rev2 = F..T..W.

[AWPC]

http://www.overclockers.co.uk/showp...=Arctic Cooling Accelero S1 Rev. 2 VGA Cooler

Put one of these on my 4870 today. Bit fiddly to do but well worth it and you only need to add either a 92/120mm fan with cable ties (I used a Xilence 120mm which is silent: http://www.overclockers.co.uk/showproduct.php?prodid=FG-000-XI). CFM is 44 not 68 as the webpage states but that is still good enough.

All the ram heatsinks are included however 1 is partially obstructed by the heatpipes on the cooler but you can twist it around then when you tighten the screws up it kind of holds it over 95% of the surface area (all of the other 7 heatsinks fit perfectly). The strip heatsink for the VRMs you can only use 1 screw to attach it and then have to use something else on the other end as the hole is not aligned (I choose a high tech material-Blutack!!).

Stock Temps before:
Idle 79-82C (depending on air temps)
Load 86-92C (depending on air temps)
Stock fan speed was only around 24-26% on load and 14-19% idle (depending on air temps). This was very noticeable to me as my other 4 case fans are silent and the 4870 gets quite loud under gaming unless you have your volume up really loud you may hear it. When I noticed it started to get bothered so had to do something about it plus lower temps are always good.

Temps with Accelero:
Idle 42-48C (depending on air temps)
Load 52-61C (depending on air temps)
Massive gains and never goes above 61C no matter what plus it is silent.

I will overclock it now as there is obviously a lot of headroom (I know the GDDR5 can hit 4400) and it is still running much cooler plus case temps have dropped by 4-6C so its all good.

Reckon it can get close to the GTX280 @ stock speeds but obviously the extra £££ spent means that it is only £30-40 cheaper overall although I suppose with the lower power useage its much cheaper to run!!

 

[AWPC]

Will let you know later as not had a chance to try it yet. But on 3Dmark01 got an extra 3000 points on stock clocks so not sure what is going on there (is it better thermals means no throttling or something else which accounts for the gain). Also got small gains on stock again with 3D marks 03 + 06 but 05 lost 3000 points so really need to see what is going on before pushing it!!

 

[AWPC]

Excellent post m8. Did it improve your overclock?

I can get 790/1090 (1st time overclock with this card) but have not tried to push it any further yet. Temps still do not rise above 66C which is excellent as still almost 20C cooler than the stock HSF.

The results below also include my older (now sold) 975X mobo & X6800 so everyone can see what performance difference it makes upgrading from 975X PCI-E 1.1 to X48 PCI-E 2.0 slots (less than 5% although I do not regret it as I have the ability to overclock my CPU FSB a lot more). Also the difference between my old 8800GTX and the 4870 as well as the effect of upgrading the CPU on X48 mobo from X6800 to Q9450.

Forceware 169.25 All Stock Speeds
44668 975x 8800GTX x6800 1360x768 =3dmark01
34653 975x 8800GTX x6800 1024x768 =3dmark03
15660 975x 8800GTX x6800 1024x768 =3dmark05
10288 975x 8800GTX x6800 1280x1024 =3dmark06

Forceware 169.25 All Stock Speeds
45341 X48 8800GTX x6800 1360x768 =3dmark01
36344 x48 8800GTX x6800 1024x768 =3dmark03
15485 x48 8800GTX x6800 1024x768 =3dmark05
10448 x48 8800GTX x6800 1280x1024 =3dmark06

8.6 cats All Stock Speeds
50010 X48 4870 x6800 1360x768 =3dmark01
36344 x48 4870 x6800 1024x768 =3dmark03
15485 x48 4870 x6800 1024x768 =3dmark05
10448 x48 4870 x6800 1280x1024 =3dmark06

8.7 cats All stock speeds
44391 X48 4870 Q9450 1360x768 =3dmark01
42215 x48 4870 Q9450 1024x768 =3dmark03
16887 x48 4870 Q9450 1024x768 =3dmark05
12931 x48 4870 Q9450 1280x1024 =3dmark06

8.7 cats + AC S1 Rev2 Heatsink
50178 X48 4870 Q9450 1360x768 =3dmark01 All Stock Speeds
50481 X48 Q9450 1360x768=3dmark01 overclocked 4870 (790/1090)

39378 X48 4870 Q9450 1024x768 =3dmark03 All Stock Speeds
43993 X48 Q9450 1024x768=3dmark03 overclocked 4870 (790/1090)

16992 x48 4870 Q9450 1024x768 =3dmark05 All Stock Speeds
17553 X48 Q9450 1024x768=3dmark05 overclocked 4870 (790/1090)

13436 x48 4870 Q9450 1280x1024 =3dmark06 All Stock Speeds
14261 X48 Q9450 1280x1024 =3dmark06 overclocked 4870 (790/1090)

I will try some games when I am happy its stable at 790/1090.

 

[AWPC]

Have your case temps been effected at all since the heat is not being vented out of the back of the PC?

Yep gone down around 10C as there is nowhere near as much heat being generated by the 4870 now as it is currently idling around 44C today vs 80C on the stock cooler!!

The heat not being blown out the back of the case is helped by the much lower temps.

 

[AWPC]

On mine with a silent low CFM 120mm fan on it only getting 64.5C max temp on Furmark.

I cannot overstate the importance of using a proper cleaner to remove the ATI TIM before sticking the heatsinks on then also ensure you have that Metal strip over the VRMs otherwise you are asking for temp trouble............

Like this one:

http://www.overclockers.co.uk/showp...=Akasa AK-TC TIM Clean CPU & Heatsink Cleaner

 

[AWPC]

Assembled my Sappire 512mb 4870 a week ago.
The gpu temp 66% idle 70 load
gpu dispio 66
gpu mem 75
gpu shader 64 idle
vddc 58
vddc 59
gpu 58 idle
I didnt like these temps so i decided to go for the s1 rev2,and a acousti 120mm fan.

quite a lot of messing about.i put the 8 ramsinks on, which came with the cooler,but couldnt put the VRMsink on as it didnt fit the holes,by then i had had enough,so i put it back in the comp to try it.

The gpu temp is now 36%idle load 39 playing WOV.
gpu temp dispio 36 idle 40 load
gpu temp mem 45 idle 48 load
gpu temp shader 42 idle 45 load

vddc 59 idle 69 load
vddc 61 idle 72 load
vddc 58 idle 70 load.
Now it has made a difference accept for the vddcs,which i thought it would,as i didnt put any sinks on them.
I dont know how to fix anything on the vrms as the sinks didnt fit,so could anyone tell me how to fix something on there,or are those vddc temps okay?
Quite willing to take the card out again to put something on if necessary.
WOV is the battle of britain sim,quite an intensive game,really stresses out the cpu and v/c.
Thanks.

Use either blutack or cable ties to put that VRM heatsink on otherwise you may find your card burns out as that area is critical and no way to get a fan over it. I used blutack on mine plus wedged it under the main heatsink fins to hold it in place.

 

[AWPC]

AWPC.

Just looked at my idle vddc,and they are 57,59 56(more or less the same as when the stock cooler was on),so do you think its worth all that trouble taking it down,whilst accepting your point of view about the VRMs?
im thinking my 120mm fan might be cooling them down,i dont know.
Thanks

m8 its up to you but better safe than sorry as under heavy gaming load those VRMs do heat up a lot. Your fan will most likely not be doing much for the VRMs as they are underneath the heatsink. Few people have not bothered and had some sort of failure. Only takes a few mins to do although be careful as even 30 mins after power your PC off the card is still very hot and easy to get burnt by it.

 

[AWPC]

AWPC
Have put that long heatsink on,which covers 3 oblong and 2 small square rams,didnt change the stuff on the heatsink,just took off the piece of paper covering the gooy stuff.
The 3 vddc temps have really changed.
at idle they are 54 60 55,load they are 69 72 66.
I hope i am covering the right rams.
Have you a photo of the VRMs which i am supposed to cover please?
Thanks.

Sorry never took any photos of mine but its pretty obvious anyway. You have 5 tiny little chips which are near the end of the card and in a 5 row pattern altogether. These are the VRM's and you will find that the supplied heatsink screws onto 1 hole then for the other you use either cable ties or blutack which is fine as the pressure from the main card heatsink above holds it down anyway. Someone bent one of the fins slightly so it holds it right down. You need to clean that stuff on the heatsinks from the stock cooler otherwise the temps will go up a bit.

 

[AWPC]

Taken Some Pics

Have circled the areas of concern where you have to do your own thing as the heatsinks supplied do not quite fit properly.