AnandTech: NVIDIA's First 55nm GPU: GeForce 9800 GTX+ Preview

A very smart man at Intel once told me that when designing a microprocessor you can either build a new architecture, or move to a smaller manufacturing process, but you don't do both at the same time. The reason you don't do both is because it significantly complicates the design, validation and manufacturing processes - you want to instead limit the number of variables you're changing in order to guarantee a quick ramp up and good yields of your silicon.

NVIDIA followed this rule of thumb with the GT200, building its "brand new" (or at least significantly evolved) architecture on a tried-and-true 65nm process instead of starting at 55nm. Despite AMD building both RV670 and the new RV770 GPU on TSMC's 55nm process, NVIDIA hadn't built anything on a smaller than 65nm process, including the 1.4 billion transistor GT200.

Shortly after the GT200 launched, AMD "responded" with its Radeon HD 4850, a cheap card by comparison, but a far more interesting one from a practical performance standpoint. Priced at $199 and selling for as little as $170, the Radeon HD 4850 managed to invalidate most of NVIDIA's product line. In response, NVIDIA dropped the price of its GeForce 9800 GTX to $199 as well and introduced one more card: a $229 GeForce 9800 GTX+.

Originally we thought the GTX+ was a silly last minute afterthought as it looked like nothing more than an overclocked 9800 GTX. While its clock speeds are higher, it also happens to be the very first 55nm NVIDIA GPU. The specs are as follows:

	9800 GTX+	9800 GTX
Stream Processors	128	128
Texture Address / Filtering	64 / 64	64 / 64
ROPs	16	16
Core Clock	738MHz	675MHz
Shader Clock	1836MHz	1690MHz
Memory Clock	1100MHz	1100MHz
Memory Bus Width	256-bit	256-bit
Frame Buffer	512MB	512MB
Transistor Count	754M	754M
Manufacturing Process	TSMC 55nm	TSMC 65nm
Price Point	$229	$199

The core clock went up 9.3%, shader clock went up 8.6% and memory clock stayed the same. The clock speed bumps are marginal and by far the more interesting aspect of the chip is how much less power it consumes thanks to its 55nm process, which thanks to AMD should be quite mature by now.

Here's the full NVIDIA lineup:

	GTX 280	GTX 260	9800 GX2	9800 GTX+	9800 GTX	8800 GTS 512	8800 GT
Stream Processors	240	192	256	128	128	128	112
Texture Address / Filtering	80 / 80	64 / 64	128 / 128	64 / 64	64 / 64	56 / 56	56 / 56
ROPs	32	28	32	16	16	16	16
Core Clock	602MHz	576MHz	600MHz	738MHz	675MHz	650MHz	600MHz
Shader Clock	1296MHz	1242MHz	1500MHz	1836MHz	1690MHz	1625MHz	1500MHz
Memory Clock	1107MHz	999MHz	1000MHz	1100MHz	1100MHz	970MHz	900MHz
Memory Bus Width	512-bit	448-bit	256-bit x 2	256-bit	256-bit	256-bit	256-bit
Frame Buffer	1GB	896MB	1GB	512MB	512MB	512MB	512MB
Transistor Count	1.4B	1.4B	1.5B	754M	754M	754M	754M
Manufacturing Process	TSMC 65nm	TSMC 65nm	TSMC 65nm	TSMC 55nm	TSMC 65nm	TSMC 65nm	TSMC 65nm
Price Point	$650	$400	$500	$229	$199	$280	$170 - $230

Notice something very wrong? The 8800 GTS 512 and 8800 GT both need to drop in price significantly, they are simply uncompetitive at their current price points. I expect one of those two products to go the way of the dodo but it's unclear which one; the 8800 GT is cheaper to make, but perhaps it's easier to produce 65nm parts with 128 SPs so the GTS 512 could stick around at a lower price point as well.

The GeForce 9800 GTX+ will be available starting July 16th.

	$124.99
	$169.99
	$132.99