apoppin
Lifer
i got a reply from Eric of OCZ ... he just doesn't know ...
--so i sent him a link to this thread and begged him to find out for us
--so i sent him a link to this thread and begged him to find out for us
Product Details:
*** NEW Custom made Male 6-pin PCI Express to Female 8-pin PCI Express 2 adapter cable from Performance-PCs.com ***
This adapter can be used to convert any 6-pin power supply PCI Express cable to a 8-pin PCI Express 2 cable. This adapter is handy for any modern PSU you recently purchased that needs the 8-pin PCI Express 2 cable connection such as for the new Radeon HD 2900 XT.
Originally posted by: Neutronbeam01
here ya go -- and I may have given them the idea to make these...right here at www.peformance-pcs.com --
Adapter to convert 6-pin PCI express to 8-pin PCI express 2.0
They will also custom make any kind of adapter you want.
Originally posted by: apoppin
you would need TWO 6-pin PCIe connectors, right ... to make ONE 8-pin connector ... and you need 2 - 8pin connectors ...
...right?
![]()
Originally posted by: apoppin
but 2 6 pin and 2 8 pin for X-fire
so 4 adapters, right?
it doesn't make any sense . ... . a 6pin to 8pin is only supplying the SAME 75W
EDIT ... i won't bump this ... but i THINK i figured it out
... maybe not ... i should just buy one, right?
PCIe slot =75w
1x 6pin PCIE = 75W
1x 8pin PCIE = 150W [which can't just be a 6pin to 8 pin adapter or it would still be 75w]
... so 300w to OC it? 225w for just the 75w slot, the 2 x 6pin PCIE 150w
:Q
600w for 2 oc'd HD2900xts
:shocked:
and connectors and adapters hanging everywhere
tell me it isn't so
Originally posted by: apoppin
but 2 6 pin and 2 8 pin for X-fire
so 4 adapters, right?
it doesn't make any sense . ... . a 6pin to 8pin is only supplying the SAME 75W
EDIT ... i won't bump this ... but i THINK i figured it out
... maybe not ... i should just buy one, right?
PCIe slot =75w
1x 6pin PCIE = 75W
1x 8pin PCIE = 150W [which can't just be a 6pin to 8 pin adapter or it would still be 75w]
... so 300w to OC it? 225w for just the 75w slot, the 2 x 6pin PCIE 150w
:Q
600w for 2 oc'd HD2900xts
:shocked:
and connectors and adapters hanging everywhere
tell me it isn't so
Originally posted by: fern420
Originally posted by: apoppin
but 2 6 pin and 2 8 pin for X-fire
so 4 adapters, right?
it doesn't make any sense . ... . a 6pin to 8pin is only supplying the SAME 75W
EDIT ... i won't bump this ... but i THINK i figured it out
... maybe not ... i should just buy one, right?
PCIe slot =75w
1x 6pin PCIE = 75W
1x 8pin PCIE = 150W [which can't just be a 6pin to 8 pin adapter or it would still be 75w]
... so 300w to OC it? 225w for just the 75w slot, the 2 x 6pin PCIE 150w
:Q
600w for 2 oc'd HD2900xts
:shocked:
and connectors and adapters hanging everywhere
tell me it isn't so
the math seem correct but it cant be a full 600 watts for two 2900's in xfire. that juicebox power supply i ordered was listed as 2900xt crossfire certified by amd and ati and its only 450 watts nominal but i didnt see a max rating, it could very well hit 600 watts on max. regardless i dont think that 600 watt number is very far off at all, id bet somewhere in the 500-600 range for two 2900's overclocked.
honestly, if you are going to do two 2900's in crossfire and you have a nice power supply that hasn't reached the end of its usefulness the best bet is to buy that juicebox i did for 100 bucks and have no worries about a zillion adapters and a rats nest.
great find by the way Neutronbeam01, i knew someone would make one but it still isnt going to put the correct watts to the card but perhaps will unlock the overdrive for people with nice beefy power supplies.
Originally posted by: nullpointerus
Overclocking with AMD Clock Tool is working with these 8.38 drivers.
I had the card up to 850/1000 MHz (a 14% GPU and 20% memory overclock) completely stable and artifact-free. I'm seeing 75/65C (GPU/PCB) max temps in normal gameplay and benchmarking w/ average temps about 3C lower. Good airflow FTW! The GPU hard locks Vista when set to 900 MHz, but I haven't tried pushing the RAM yet.
Performance increases only in certain situations with my overclock. 3DMark 05 increases from 11300 to 11500.I see some gains in FEAR, but only close to a linear increase when AA is turned up. I'm obviously CPU limited. Performance in FEAR at 1680x1050 med/high w/ stock clocks is 56/36/41% (0x/2x/4xAA) higher than my 7900 GTO in the same rig.
Here's something I didn't know about: in CCC, setting the AA type to Wide Tent (not the level) while keeping the level set to Application Preference lets the games use Wide Tent when you configure AA in the games' settings.
There's a huge performance hit going from Box to WT. I accidently left WT on (with CCC AA set to Application Preference!) and had to rebench a few times to keep my charts consistent. I wonder if some reviewers encountered the same problem? Or is this well-known in the AMD camp? We saw some really odd benchmark results on launch day.
UPDATE: I finally submitted a request to HIS (although their website is still quite slow). Sometime next week we'll see what they have to say regarding these "missing" 8-pin adapters.
Originally posted by: nullpointerus
My rig is CPU limited, and I was "time limited," so I ran '05. I'll probably get to '06 later tonight or in the morning. My '05 score was pretty close to yours ~9300 before this upgrade, if that's useful. Bang for buck--not worth it. I *may* sell the card since it was going for $450 on eBay last time I checked.
:Q
Oddly, with RAM prices the way they are (were?), I could probably sell my current mobo+CPU+RAM and upgrade to an inexpensive C2D setup for the cost of shipping. I'll have to check out some components and see whether that's feasible. Any advice? I'm looking for a board that's got Crossfire and passive chipset cooling (if possible).
Originally posted by: nullpointerus
Here's something I didn't know about: in CCC, setting the AA type to Wide Tent (not the level) while keeping the level set to Application Preference lets the games use Wide Tent when you configure AA in the games' settings.
There's a huge performance hit going from Box to WT. I accidently left WT on (with CCC AA set to Application Preference!) and had to rebench a few times to keep my charts consistent. I wonder if some reviewers encountered the same problem? Or is this well-known in the AMD camp? We saw some really odd benchmark results on launch day.
It's not grayed out in my CCC. I can change the filter regardless of whether the AA level is set to Application Preference or not.Originally posted by: fern420
Originally posted by: nullpointerus
Here's something I didn't know about: in CCC, setting the AA type to Wide Tent (not the level) while keeping the level set to Application Preference lets the games use Wide Tent when you configure AA in the games' settings.
There's a huge performance hit going from Box to WT. I accidently left WT on (with CCC AA set to Application Preference!) and had to rebench a few times to keep my charts consistent. I wonder if some reviewers encountered the same problem? Or is this well-known in the AMD camp? We saw some really odd benchmark results on launch day.
question, when i try to do this my box that allows me too chose the filter is grayed out, now i can choose tent then then go to application preference but the box for filter is again grayed out. are you saying if i chose tent before i chose application pref for the level the tent option will "stick" even though its grayed out once you pick application for the level?
Originally posted by: ROEHUNTER
Back to the OP, I noticed that the MSI 2900XT on the egg has the 8 pin adaptor included.
Originally posted by: apoppin
Originally posted by: fern420
Originally posted by: apoppin
but 2 6 pin and 2 8 pin for X-fire
so 4 adapters, right?
it doesn't make any sense . ... . a 6pin to 8pin is only supplying the SAME 75W
EDIT ... i won't bump this ... but i THINK i figured it out
... maybe not ... i should just buy one, right?
PCIe slot =75w
1x 6pin PCIE = 75W
1x 8pin PCIE = 150W [which can't just be a 6pin to 8 pin adapter or it would still be 75w]
... so 300w to OC it? 225w for just the 75w slot, the 2 x 6pin PCIE 150w
:Q
600w for 2 oc'd HD2900xts
:shocked:
and connectors and adapters hanging everywhere
tell me it isn't so
the math seem correct but it cant be a full 600 watts for two 2900's in xfire. that juicebox power supply i ordered was listed as 2900xt crossfire certified by amd and ati and its only 450 watts nominal but i didnt see a max rating, it could very well hit 600 watts on max. regardless i dont think that 600 watt number is very far off at all, id bet somewhere in the 500-600 range for two 2900's overclocked.
honestly, if you are going to do two 2900's in crossfire and you have a nice power supply that hasn't reached the end of its usefulness the best bet is to buy that juicebox i did for 100 bucks and have no worries about a zillion adapters and a rats nest.
great find by the way Neutronbeam01, i knew someone would make one but it still isnt going to put the correct watts to the card but perhaps will unlock the overdrive for people with nice beefy power supplies.
they need to make an adapter using two 75w connectors into an 8-pin 150w connector
as to your "booster" ... i believe "all" it needs to do is supply the "extra" needed for x-fire/OC'ing ... the two "extra" 8-pin connectors ... one for each card to supply the extra oomph for each card ... at least 300w ... your original PS supplies everything else for "normal" operation
honestly ... after reading all this ... i am probably backing away from HD2900xt ...:brokenheart:
i dunno ... it's gonna ALL depend on pricing ... for me
of course, i'd have NO problem running 8800Ultra SLI on my current PS
---just on my pocketbook![]()
