CNPS7500 - Real Successor to CNPS7000/7700?

merlin · Post by **merlin** » Mon Feb 05, 2007 4:53 pm

Seeing as the CNPS8000 was a pretty big disappointment from a cooling standpoint, looks like Zalman went back to their original flower design for a new low profile cooler. Seeing as the height on the CNPS7500 is 67mm, I'd assume any case with at least 75mm of headroom would be able to handle having this cooler. Zalman's noise specs are actually quite a bit lower than the 7000/7700 as they're showing specs of 17db on the 5v setting, of course the real proof will be in the silentpcreview. Hope to get some real world info on this soon...

The most important aspect to me is the out of the box AM2 and 775 compatability. Finally something every system can use. As long as it's still in the $30 range, this looks like a very sexy budget choice.

nici · Post by **nici** » Mon Feb 05, 2007 5:11 pm

It has a faster fan than the 7700. The minimum fan speed of the 7700 is 1000rpm, the 7500 is 1150rpm. The C/W values of the 7700 is 0.19-0.24, but they dont say what they are for the 7500. Surface area has increased form 3,268 cm2 to 3.500 cm2.

Mats · Post by **Mats** » Mon Feb 05, 2007 5:24 pm

67 mm high, just like the 7700. The 7000 is 63 mm.
But it better be dead silent since it's pretty much impossible to find a new fan for it, thanks to the odd 110 mm fan. Oh and 848 g for the Cu version, and no heatpipes. My guess is that the AMD X2 cooler does the job just as good (or better) and got a lower weight, you just need a new fan. The choice of HSF can never be sexy, IMO.

nici · Post by **nici** » Mon Feb 05, 2007 6:05 pm

A 120mm fan is 110mm without the frame.

Felger Carbon · Post by **Felger Carbon** » Mon Feb 05, 2007 7:06 pm

nici wrote:A 120mm fan is 110mm without the frame.

I have an SFlex 21E sitting beside my computer, and a 300mm .04" steel machinist's scale from McMaster. I measure 114mm from blade tip to blade tip, the the scale edge passing thru the center of the fan hub. That's from near the leading edge of one blade to near the trailing edge of the other blade, which is why I can measure tip-to-tip on a 7-blade fan.

nici · Post by **nici** » Mon Feb 05, 2007 7:38 pm

Oh bugger. You could fit a 120mm fan in the 7700, but you cant in this. I looked at the pictures more closely, and it seems they have incresed the surface area around the base, and just where the fan is, on the inside. So you are stuck with the stock fan, and even if it miracuilously ran at 3.5V you would still run at 800rpm+

[F]bernZ · Post by **[F]bernZ** » Mon Feb 05, 2007 7:47 pm

Linky?

the_beast · Post by **the_beast** » Tue Feb 06, 2007 6:13 am

would a Noctua NF-S12 fit? If I remember correctly the Noctua fans have a larger than normal gap between the blades & frame, so it might just be mountable. Would probably be really tight though and you'd have to make sure the mounting was exactly central.

A 92mm fan might work instead though and would be really easy to mount, but you'd probably need some kind of duct/plate around the top to force all the air where you want it to go.

Bluefront · Post by **Bluefront** » Tue Feb 06, 2007 4:57 pm

Heh....you guys give up too easily. You want a different fan? Cut a small amount off the tip of each blade and any 120mm fan could be used. I've done it several times....careful cutting and measuring is all that is necessary.

[F]bernZ · Post by **[F]bernZ** » Tue Feb 06, 2007 5:55 pm

Yeah, but then again we'll have a possibly unbalanced fan.
We'll have to wait and see until more pictures come out for the HSF.

Post by **NeilBlanchard** » Tue Feb 06, 2007 8:13 pm

Hello,

[F]bernZ wrote:Linky?

http://www.zalman.co.kr/eng/product/vie ... 8&code=005

You could also use the Scythe 100mm fan?

Bluefront · Post by **Bluefront** » Wed Feb 07, 2007 3:44 am

[F]bernZ....like I said, it's a matter of being careful. If you want to be anal about it, get a small digital scale. measure the weight of each piece you cut off each blade. It shouldn't be too difficult.

FWIW.....I've cut apart several fans to see how they were balanced. Very primitive. They use a dab of epoxy on one side of the hub that serves as a balance weight. And they probably test each fan and throw out the ones that shake. (SilenX and Thermaltake buy up these culls

)

merlin · Post by **merlin** » Wed Feb 07, 2007 11:30 am

You guys all make great points about possible issues with this heatsink. I was looking at it more from a stock viewpoint comparing against the older models. It looks like it could at least be a minor improvement in that regard. As long as the stock noise level is lower or equal to the ones before, it'll still be a decent choice.

Personally if I were going to replace the 110mm, I'd look for a good 92-100mm fan.

nutball · Post by **nutball** » Wed Feb 07, 2007 12:58 pm

Personally I'd go for a 92mm fan. But then I don't try to cool CPUs which need more than that in a low-profile case. Just personal taste I guess.