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fastest way to draw spheres

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I want to know if someone knows a faster way than the one I have to draw a lot of spheres (around 5000)

 

The position of each sphere is in each texel of a 2DTexture

the positions are only In GPU memory(CPU never knows them)

the spheres can intersect so the depth is important to show that

 

The way I draw them:

I have the 3D mesh of the sphere(very low res mesh with only 12 vertices)

I use DrawIndexedInstanced() function to draw them all

Edited by lomateron

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