Overclocking the 7800GTX Videocard
because PCSTATS is testing the fastest videocard on the market doesn't mean it's
going to be spared the overclocking tests. ;-)
the first GeForce 7800 GTX videocard to make it by the test bench, so it will be
interesting to see what nVidia has in store for enthusiasts...
the Geforce 7800GTX core is clocked at 430 MHz, and memory at 1200MHz by
default, so how much further can we push things?
Let's find out by increasing the speed of the GPU
first, in 5 MHz intervals all the way to 500 MHz. Well... it almost reached that point,
unfortunately the highest the core would run by itself was 497 MHz, anything
higher and the RivaTuner would complain about it not passing the driver test. I
actually was expecting more from the 0.11 micron TSMC core, but it looks as
though we'll have to wait and see what the future has in store.
The Albatron GeForce 7800 GTX uses Samsung GC16 GDDR3
BGA DRAM modules with a 1.6 ns rating. The memory hums along at a speed of 1200
MHz by default, so we increased its pace in 10 MHz jumps; 1250, 1260 and 1270
MHz fell by the wayside easily enough. The 1300 MHz mark was also cracked
quickly before the Samsung GDDR3 topped out at 1390 MHz, or 1.39GHz. Attempts at
higher memory speeds caused RivaTuner to complain about "failing hardware"
overclocking the clock speed of the core and memory independently is quite easy
to do, getting the two to run overclocked together is a whole other story. I did
try running both the Albatron 7800GTX's core and memory at the maximum
overclocked speeds, but that only produced a screen full of artifacts. After
much frustration, I found that I had to lower both the core and memory speed
quite significantly. Stability required the core to drop down to 479 MHz and the
memory to fall back 1347 MHz.
that better cooling would have helped, which is almost always the case when
overclocking. While running overclocked, the memory heatspreader on the back of
the 7800GTX videocard was too hot to touch, and the core was running around 73
degrees Celsius! Still, the reference card based Albatron GeForce 7800GTX
produced pretty good overclocking results.
|PCStats Test System Specs:|
AMD Athlon64 4000+
12 x 200 MHz = 2.4 GHz
DFI LANParty NF4 SLI-DR (NF4-SLI)
Radeon X800 XL
PowerColor X700 PRO
PowerColor Bravo X700
GeForce 7800 GTX SLI
MSI NX6800-TD128E (Single)
Gigabyte GV-3D1 (Single Mode)
Gigabyte GV-3D1 (SLI
MSI NX6600GT-TD128E (Single Mode)
Albatron GeForce 7800 GTX
2x 512MB Mushkin PC3200 L2 V2
||74GB WD Raptor 10k RPM SATA HDD|
||AOpen 52x Combo|
||Seasonic Super Tornado 400W|
||Prometeia Mach II GT (review)|
WindowsXP Build 2600
Gun Metal 2
AA Test, AF and AA+AF Test
and PCI-E systems use a different motherboard but results are shown for
reference. Unfortunately there are no AquaMark3 numbers for this review, we
could not get the benchmark working.
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