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Corsair TX series changes - what we did, why we did it, and how it affects you. - Page 4

post #31 of 111
Quote:
Originally Posted by shinji2k;11842122 
Come on. What's with you lately?

- Much smaller heatsinks (more prone to overheating)
Since those same heatsinks are used on the 950W DSG, they will have no issue keeping the 750W PSHII cool.

Maybe so, but a more robust heatsink would likely improve efficiency and long term lifespan. It's not a huge downgrade, but it's still a downgrade.
Quote:
- Less robust transient filter (one fewer coil, one pair less Y-caps, think there are a couple other fewer)
As far as I can tell, the exact same input filter is used on the DSG. Again, where was the outcry then?

DSG uses the same filter as PSH...
Quote:
- Single layer PCB (instead of 2 or 3 layer)
If it will all fit on a single PCB, what's the big deal? I've seen many PSUs with dual layer PCBs with only a few traces on the top. If they managed to organize it so it all fits on one side, how it that of a lower quality? Maybe there's something I'm missing.

Good point. It's cheaper to make, but not necessarily cheaper in quality.
Quote:
- Less primary side capacitance (lower hold-up time, etc.)
The reviews I just looked at has the PSH TX750 using a 390uF 400V Matstu****a and your pic of the PSHII TX750 uses a 470uF 400V cap. Am I missing something here?

That was my honest mistake, for some reason I thought the original used a 560uF or something... So scratch that one.
Quote:
You also have a comment floating around about how six 12V MOSFETs are much more prone to failure than two, but again I don't see you raking Enermax or Enhance over the coals with their eight MOSFET 12V rectification.

As I said in the post you quoted, there are pros and cons to it so I called it even.
post #32 of 111
Quote:
Originally Posted by shinji2k View Post
Come on. What's with you lately?

- Much smaller heatsinks (more prone to overheating)
Since those same heatsinks are used on the 950W DSG, they will have no issue keeping the 750W PSHII cool.

- Less robust transient filter (one fewer coil, one pair less Y-caps, think there are a couple other fewer)
As far as I can tell, the exact same input filter is used on the DSG. Again, where was the outcry then?

- Single layer PCB (instead of 2 or 3 layer)
If it will all fit on a single PCB, what's the big deal? I've seen many PSUs with dual layer PCBs with only a few traces on the top. If they managed to organize it so it all fits on one side, how it that of a lower quality? Maybe there's something I'm missing.

- Less primary side capacitance (lower hold-up time, etc.)
The reviews I just looked at has the PSH TX750 using a 390uF 400V Matstu****a and your pic of the PSHII TX750 uses a 470uF 400V cap. Am I missing something here?

You also have a comment floating around about how six 12V MOSFETs are much more prone to failure than two, but again I don't see you raking Enermax or Enhance over the coals with their eight MOSFET 12V rectification.
To be blatantly honest Phaedrus, I do agree with Shinji here. I'm not trying to gang up on you, but just because it doesn't appear as robust as the older platform, doesn't mean it can't perform as well. Switching power supplies aren't all about brute hardware. If you pile them with capacitors and huge heatsinks, it doesn't mean its going to perform better. Switching topologies are dependent on other things, such as layout. If you had a linear power supply, sure, this would work, but SMPSs are different in this manner. If Channel Well has figured out a more efficient design and can fit onto a single sided PCB and can outdo a more expensive multilayer board with more heatsinks...then so be it.

And just to comment on the primary capacitor. The older TX used a 390uF Panasonic cap. The new TX uses a 470uF Chemi-Con cap. Both are rated for up to 400V. Both are very good caps, quality wise. Maybe you just mixed up your information.

The transient filter circuit has changed slightly. There is indeed one less coil, but three coils is hardly necessary. Even big dogs like the X-750 only have two coils.

I'm not trying to be crude or offensive, but the internals being changed, yes, should have been announced, but it's not like they really screwed us.
Edited by TheLaw - 12/31/10 at 9:45am
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post #33 of 111
Yes, and I'm not accusing them of really screwing us. I hold that it's slightly lower build quality, yes, and better performance. My beef with them is not being clear in their communication. And I still insist that they send out the TX650-C for review, since that's not just a change of platform but a change of manufacturer.


EDIT: And the whole CX series thing, but that's a different matter.
post #34 of 111
Quote:
Originally Posted by Phaedrus2129 View Post
DSG uses the same filter as PSH...
From Hardwaresecrets...

TX750-
3 coils
6 Y caps
2 X caps
1 MOV

HX750-
2 coils
4 Y caps
2 X caps
1 MOV

From your pic...

TX750 (PSHII)
2 coils
4 Y caps
2 X caps (admittedly I can't see the second one on the AC socket but I do see the heat shrink that's normally around it)
1 MOV
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post #35 of 111
HX750 clearly has at least three coils:
http://www.newegg.com/Product/ImageG...Power%20Supply
post #36 of 111
I don't think the amount of coils is really a matter for discussion.

However, HX750 has two coils.

http://hi-techreviews.com/Reviews_20...0/DSC06258.JPG
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post #37 of 111
Many thanks to George from Corsair for stepping up, and resolving this whole issue. My confidence in Corsair is redeemed with the admission that they didn't do it right.
I now fully understand what happened, why, and how it affects everything... well, almost...

How temporary are these -C models? I assume we're looking at some point in 2011 for the TX2?
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post #38 of 111
CorsairGeorge, you make it sound like Corsair is just a small company with a small handfull of devs/employees. If that's how it is, BRAVO!
post #39 of 111
The changes in the TX series can be forgotten I guess. The CX430 is inexcusable.
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post #40 of 111
There goes the value of my "old" TX750W I still need to sell
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